Page Speed After a Website Redesign
How to improve and protect page speed after a website redesign — Core Web Vitals, what slows sites down, and how to fix issues fast.

Page speed after a website redesign almost always gets worse, not better, unless performance is treated as a design constraint from the first wireframe rather than an optimization task addressed at launch.
Most redesign teams discover this the hard way, after go-live, when Google Search Console surfaces Core Web Vitals failures and analytics shows increased bounce rates from mobile visitors.
The myth is that a new site is a faster site.
New visual frameworks, larger images, third-party scripts, and sophisticated interactions consistently introduce performance debt. Understanding why this happens is the first step toward preventing it before it costs time and money to fix.
Key Takeaways
- New Designs Introduce Performance Debt: Visual frameworks, large images, and third-party scripts commonly degrade page speed even on well-intentioned new sites.
- Core Web Vitals Are Ranking Factors: LCP, INP, and CLS directly affect search rankings; performance regressions after launch have measurable SEO consequences.
- Test on Staging, Not in Development: Real-world PageSpeed Insights scores often differ dramatically from local development environments where no throttling applies.
- Mobile Performance Matters More: Over 60% of searches occur on mobile; mobile speed improvements generate disproportionate ranking and conversion gains.
- Performance Must Be a QA Gate: Sites that do not pass Core Web Vitals thresholds before launch should not launch until they do; shipping performance debt is harder to recover from than delaying launch.
Why Page Speed Gets Worse After Redesigns
Understanding the root causes of post-redesign performance degradation is essential to preventing it. The causes are consistent across projects, which means they are also consistently preventable.
Performance problems introduced during a redesign are expensive to fix retroactively. Each of the following causes has a corresponding prevention strategy that is far cheaper when applied before development begins.
New Visual Frameworks Add Script Weight
CSS frameworks like Bootstrap and Tailwind, JavaScript libraries for interaction and animation, and design system components each contribute load time and render-blocking resources, even when they are implemented by skilled developers following best practices.
- Full Bootstrap Includes CSS That Pages Never Use: Unused CSS from large frameworks adds kilobytes of render-blocking stylesheet that slows initial rendering without contributing any visible benefit.
- Animation Libraries Have Measurable JavaScript Weight: GSAP, AOS, and similar animation libraries add JavaScript payloads that must parse and execute before animations run, contributing to INP scores.
- Multiple Libraries for Overlapping Functionality Compound the Problem: A redesign that adds jQuery for one feature, React for another, and a vanilla JS slider for a third combines their overhead in ways that individually seem justified but collectively create significant load.
- Tree-Shaking Reduces but Does Not Eliminate Framework Weight: Build tools that eliminate unused code reduce framework overhead substantially but require explicit configuration that is often missed in time-pressured redesign projects.
Framework and library choices made during architecture planning have larger performance consequences than most developers account for. Evaluate the performance cost of each dependency before adding it to the project.
Unoptimized Images From the New Design
Designers frequently deliver high-resolution mockup images that are uploaded directly to the CMS without compression, format conversion, or lazy loading configuration. Hero images are the most common offender.
- Design Mockup Images Are Not Web-Ready: A 5MB Photoshop export that looks great in a mockup review is a LCP disaster when uploaded directly to the live site.
- CMS Upload Does Not Auto-Optimize by Default: WordPress, Webflow, and most other CMS platforms do not automatically compress, resize, or convert images to modern formats without explicit plugin or configuration investment.
- Hero Image Is Almost Always the LCP Element: The largest visible element at page load is most commonly the homepage hero image; its optimization has the single largest impact on LCP score of any element on the page.
- Multiple Image Sizes Require srcset Implementation: Serving the same image to a mobile phone and a 4K monitor wastes bandwidth on mobile and degrades LCP; responsive image implementation is rarely configured in baseline redesigns.
Image optimization should be a launch requirement, not a post-launch improvement ticket. Define image quality standards, format requirements, and maximum file size limits before the first asset is uploaded.
Third-Party Script Proliferation
Redesigns routinely introduce new analytics platforms, live chat widgets, CRM tracking, marketing automation pixels, and A/B testing tools. Each script adds page weight and introduces potential Cumulative Layout Shift issues.
- Each New Script Has a Compounding Load Cost: Every third-party script adds a DNS lookup, a connection, a download, and script execution time; five scripts add five multiplied contributions to total page load time.
- CLS from Late-Loading Chat Widgets Is Common: Chat widget bubbles that appear after initial render push content down, causing CLS violations that are both visually disruptive and ranking-penalizing.
- Marketing Automation Scripts Are Often Redundant: Redesigns that add HubSpot on top of existing Google Analytics and an existing CRM tracker often carry three tools doing overlapping work; audit before adding.
- Tag Manager Is Both Solution and Risk: Google Tag Manager allows script management without deploys but makes it easy to add scripts without performance review; every GTM tag addition should require a performance impact evaluation.
Establish a third-party script approval policy before the redesign launches. Every new script requires a performance impact review before it is deployed to the live site.
CMS-Generated Code Bloat
Page builder tools and visual editors, Elementor, Divi, WP Bakery, and equivalents, generate HTML and CSS that is more verbose than hand-coded templates, slowing rendering compared to leaner implementations.
- Page Builder Output HTML Is Verbose: Visual editors generate nested div structures with inline styles and class names that produce significantly more HTML than the same design implemented with clean templates.
- Unused Inline CSS Increases Document Weight: Page builders often include all possible style options as inline CSS, even for options not used on a specific page, increasing the HTML document size unnecessarily.
- CSS Class Name Proliferation Slows Selector Matching: Thousands of unique CSS class names generated by visual editors slow browser style matching in ways that compound on pages with complex layouts.
- Database Queries Increase with Serialized Builder Data: Page builders store layout data in WordPress database fields that require additional queries to parse, adding server-side processing time to TTFB.
The page speed SEO impact of code bloat from visual editors is real and measurable. Where performance is critical, hand-coded templates or platform-specific components outperform page builder implementations.
Core Web Vitals: What You're Actually Measuring
Using the QA checklist for redesign as a framework for performance testing starts with understanding what Core Web Vitals actually measure and why each metric matters for real users.
Core Web Vitals are not arbitrary technical benchmarks. Each metric corresponds to a specific user experience failure that causes visitors to leave or fail to convert.
Largest Contentful Paint (LCP)
LCP measures the time it takes for the largest visible content element to render in the viewport.
The good threshold is under 2.5 seconds; needs improvement is 2.5 to 4.0 seconds; poor is over 4.0 seconds.
- LCP Element Is Most Commonly the Hero Image: The homepage hero image, a large heading, or an above-fold video is almost always the LCP element; identify it explicitly and optimize that specific asset.
- Render-Blocking Resources Delay LCP: CSS and JavaScript in the document head that must parse before rendering can begin delays LCP even when the LCP element itself is optimized.
- Slow Server Response Cascades to LCP: A TTFB over 600ms pushes back every subsequent render event including LCP; slow hosting directly causes LCP failures independent of asset optimization.
- LCP Threshold Differs Between Mobile and Desktop: Mobile devices load the same content with less bandwidth and lower CPU; mobile LCP scores are consistently worse than desktop for the same page and require specific optimization attention.
LCP is the most directly actionable of the three Core Web Vitals because it is almost always caused by a specific, identifiable asset or resource. Find the LCP element and optimize it first.
Interaction to Next Paint (INP)
INP measures a page's responsiveness to user input throughout the entire browsing session, capturing the worst interaction latency experienced by a user during their visit.
- INP Replaced FID in 2024: First Input Delay measured only the first interaction; INP measures responsiveness throughout the session, catching JavaScript that degrades interaction quality after the page has fully loaded.
- Long Tasks Are the Primary INP Cause: JavaScript tasks that exceed 50 milliseconds on the main thread block the browser from responding to user input; INP failures are almost always traceable to specific long tasks.
- Third-Party Scripts Commonly Cause INP Failures: Marketing automation, analytics, and chat scripts that run on the main thread after page load are frequent INP offenders that designers and developers often do not think of as their responsibility.
- React and Other SPA Frameworks Can Cause INP Issues: Client-side rendering frameworks that do heavy JavaScript work after hydration can produce INP failures on pages that have no obvious performance issues in development.
INP is the most recently added Core Web Vitals metric and the least intuitively understood. Measure it using real user monitoring tools, not only lab-based Lighthouse tests that do not capture session-long interaction patterns.
Cumulative Layout Shift (CLS)
CLS measures visual stability, specifically, the sum of unexpected layout shifts that occur during page load. The good threshold is under 0.1; needs improvement is 0.1 to 0.25; poor is above 0.25.
- Images Without Explicit Dimensions Cause CLS: A browser that does not know an image's dimensions cannot reserve space for it; when the image loads, it pushes surrounding content down, creating a layout shift.
- Late-Loading Web Fonts Cause Text Shift: When a web font loads and replaces the fallback font, differences in character width cause text to reflow; font-display: swap with preloaded fonts mitigates this.
- Dynamic Content Above Static Content Causes Shift: A banner, notification, or chat widget that appears above existing page content after load causes everything below it to shift down, generating CLS.
- Embeds and Iframes Without Aspect Ratios Shift Layout: Social media embeds, video iframes, and advertisement slots that load after the surrounding page content are common CLS sources in redesigned sites.
CLS failures are particularly disruptive on mobile where screen real estate is limited and content shifts cause users to lose their place in the page.
They are also among the easiest to prevent with explicit height and width declarations on all media elements.
How to Test Page Speed During and After Redesign
Effective performance testing requires using the right tools at the right stages of the redesign process. Testing too late limits the cost-effectiveness of fixes; testing only locally misses real-world performance conditions.
Google PageSpeed Insights
PageSpeed Insights provides both lab data from Lighthouse and field data from the Chrome User Experience Report for any public URL. The Diagnostics section identifies the highest-impact opportunities.
- Mobile and Desktop Scores Are Reported Separately: Always check mobile scores first; they are consistently lower and more business-critical than desktop scores.
- Diagnostics Section Prioritizes by Impact: The "Opportunities" and "Diagnostics" sections list improvements ranked by estimated time savings; start with the highest-impact items.
- Field Data Reflects Real User Experience: When CrUX data is available for a URL, the field data section shows actual user experience rather than a simulated test environment.
- Run Multiple Tests for Consistency: Server response time variability can cause individual test scores to fluctuate; run three to five tests and use the median result for baseline documentation.
PageSpeed Insights is the primary performance tool for most redesign QA workflows because it uses the same infrastructure as Google's Core Web Vitals reporting in Search Console.
Lighthouse in Chrome DevTools
Lighthouse audits run locally in Chrome DevTools provide more granular diagnostic information than PageSpeed Insights, including the ability to simulate mobile conditions and capture performance during development before pages are publicly accessible.
- Lighthouse Categories Beyond Performance: Run the full Lighthouse audit, Performance, Accessibility, Best Practices, and SEO, as a pre-launch QA gate, not just the performance category.
- Mobile Simulation Requires Explicit Configuration: Lighthouse defaults to simulated mobile in PageSpeed Insights but requires explicit selection in DevTools; always test with mobile throttling settings that reflect real-world mobile conditions.
- Lab vs. Field Data Are Different Things: Lighthouse produces lab data from a controlled test environment; it is valuable for development debugging but may not match field data from real users on real networks.
- Treemap View Identifies Bundle Composition: The Lighthouse coverage treemap identifies which JavaScript files are loaded and what percentage of each file's code is actually used on the page.
Lighthouse in DevTools is the developer's primary performance debugging tool. PageSpeed Insights is the performance reporting tool. Use both at appropriate stages of the project.
WebPageTest for Deep Diagnostics
WebPageTest provides waterfall charts, filmstrip views, and connection throttling options that identify exactly which resources are causing performance bottlenecks on a page-by-page basis.
- Waterfall Chart Shows Resource Loading Sequence: The waterfall view reveals which resources are render-blocking, which load in parallel, and where the critical path can be shortened.
- Filmstrip View Shows Visual Progress: A frame-by-frame filmstrip of the page loading helps identify exactly when the page becomes visually useful to a user and what causes delays.
- Custom Connection Throttling Tests Real-World Conditions: Testing on 4G, 3G, or cable conditions simulates what real users experience across different network environments.
- Repeat View Measures Caching Effectiveness: Running both first-view and repeat-view tests reveals whether caching is working correctly; a repeat-view score significantly worse than expected suggests caching configuration failures.
WebPageTest is the most powerful diagnostic tool for performance debugging but requires more interpretation skill than PageSpeed Insights. Use it when Insights surfaces problems that require deeper investigation to root-cause.
The AI tools for website redesign landscape is also evolving to include performance analyzis tools that can identify image compression opportunities and script loading issues automatically during the design phase.
Mobile-Specific Page Speed Issues to Address
The mobile speed after redesign challenges differ from desktop problems. Mobile devices have less CPU, less RAM, and variable network connections, so page weight that is adequate on desktop often performs poorly on mobile.
Hero Images Not Responsive or Sized for Mobile
Hero images sized for desktop viewports waste significant bandwidth on mobile devices where a 1,920-pixel image is displayed in a 390-pixel viewport. Responsive image delivery with srcset eliminates this waste.
- srcset Serves Appropriately Sized Images: The srcset attribute allows the browser to select the image size that matches the actual viewport, serving a 400px image to a phone rather than a 2,000px desktop image.
- sizes Attribute Helps Browser Selection: The sizes attribute tells the browser what size the image will display in the layout, enabling it to select the correct srcset candidate before the image loads.
- Different Crops May Be Required for Mobile: A hero image that works as a wide landscape on desktop may need a portrait or square crop to work on mobile; the picture element with art direction breakpoints handles this.
- Hero Image Is Almost Always the Mobile LCP Element: Since mobile LCP thresholds are the same as desktop thresholds but mobile connections are slower, responsive hero images have a larger LCP improvement impact on mobile than on desktop.
Implementing responsive hero images is the single highest-impact mobile performance improvement available on most redesigned sites. Do not ship without it.
Touch Interaction Delays and INP on Mobile
Mobile devices are more sensitive to JavaScript execution delays than desktops because mobile CPUs are less powerful. JavaScript that runs on the main thread blocks touch interaction responses, degrading INP.
- Event Listeners Should Not Block Main Thread: Touch event handlers that do synchronous JavaScript work during the touch event delay the visual response that users expect immediately on tap.
- Passive Event Listeners Improve Scroll Performance: Adding the passive option to scroll and touch event listeners tells the browser it can process the scroll immediately without waiting for the handler to complete.
- JavaScript Must Be Audited for Long Tasks: Use Chrome DevTools Performance panel to identify tasks longer than 50ms during interaction; these are the specific code paths causing INP failures.
- Debouncing and Throttling Reduce Input Processing Load: Input handlers that fire on every keypress or touchmove event should be debounced or throttled to reduce main thread pressure during continuous interaction.
Mobile INP optimization requires performance profiling during real user interaction on a physical mobile device, not just during synthetic Lighthouse testing.
Font Loading and CLS on Mobile Connections
Web font loading on slower mobile connections causes layout shifts when text renders in the fallback font first and then reflowst as the web font loads.
The combination of font-display: swap and font preloading mitigates this effectively.
- font-display: swap Prevents Flash of Invisible Text: Setting font-display: swap in the @font-face rule ensures text is visible immediately in the fallback font while the web font loads.
- Preloading Critical Fonts Reduces Swap Duration: Using
for the most critical font files starts loading them earlier in the resource waterfall, reducing the time the fallback font is visible. - Size-Adjust Property Minimizes Layout Shift: The CSS size-adjust descriptor adjusts the fallback font's size to match the web font's metrics more closely, reducing the visual impact of the font swap.
- System Font Stack Eliminates Font CLS Entirely: For performance-critical projects where font loading CLS is significant, using a system font stack eliminates the problem at the cost of custom typography.
Font-related CLS on mobile is one of the most solvable performance problems in redesigned sites. It requires only CSS changes and a preload declaration, no images to compress or scripts to defer.
How to Improve Page Speed After a Redesign
If the redesign has already launched with performance problems, prioritize improvements by impact rather than by ease.
The highest-impact improvements will typically take the site from failing Core Web Vitals to passing more quickly than working through a comprehensive list of smaller optimizations.
Image Optimization (Highest Impact)
The full image optimization stack, compression, format conversion to WebP or AVIF, lazy loading for below-fold images, and explicit width and height attributes, typically produces the largest single performance improvement for most redesigned sites.
- Compression Before Upload Is Non-Negotiable: Tools like TinyPNG, Squoosh, or ImageOptim should be part of the asset preparation workflow before any image goes into the CMS.
- WebP Reduces File Size by Approximately 30%: Converting JPEG images to WebP format reduces file size by roughly 30% at equivalent visual quality; most browsers have supported WebP since 2016.
- Lazy Loading Requires only a Loading Attribute: Adding
loading="lazy"to img elements below the fold defers their loading until the user scrolls toward them, reducing initial page weight without any additional tooling. - Width and Height Attributes Prevent CLS: Explicitly declaring width and height on all img elements allows the browser to reserve the correct space before the image loads, eliminating layout shifts.
Start image optimization by identifying the images with the largest file sizes on the highest-traffic pages. These have the largest performance and SEO impact and are worth addressing before systemizing the workflow.
Reducing Render-Blocking JavaScript and CSS
Deferring non-critical JavaScript, inlining critical CSS, and auditing third-party scripts for load-time contribution are the three highest-impact render-blocking improvements available in most redesigned sites.
- Defer Non-Critical JavaScript: Adding the defer attribute to scripts that do not need to execute before the page renders eliminates their blocking effect on initial render without changing their execution behavior.
- Inline Critical CSS Eliminates Stylesheet Blocking: The CSS required to render above-fold content can be inlined in the document head, eliminating a render-blocking external stylesheet request for the most important content.
- Coverage Report Identifies Unused CSS and JS: Chrome DevTools Coverage report shows what percentage of each stylesheet and script is used on a given page; files with less than 20% usage are candidates for removal or code splitting.
- Third-Party Scripts Can Be Loaded Asynchronously: Using the async attribute for third-party analytics and marketing scripts allows them to load without blocking the page's critical rendering path.
Render-blocking resource reduction is the second most impactful performance improvement category after image optimization for most newly redesigned sites. Both should be addressed before any other optimization work.
Server Response Time and Hosting Upgrades
Hosting tier, CDN configuration, and caching header implementation affect Time to First Byte, which sets a floor below which no client-side optimization can push the LCP. When TTFB exceeds 600ms, hosting investigation is required.
- Shared Hosting Produces Consistently Poor TTFB: Sites on low-tier shared hosting plans often produce TTFB over 1 second, which pushes LCP well past the 2.5-second threshold regardless of client-side optimization.
- CDN Reduces Geographic Latency: A content delivery network serves static assets from the nearest edge node, reducing the physical distance that data must travel and improving load time for users far from the origin server.
- Server-Side Caching Reduces TTFB for Repeat Pages: Full-page caching on WordPress sites (WP Rocket, W3 Total Cache) and equivalent caching on other platforms reduces server processing time for frequently visited pages.
- Database Query Optimization Reduces Dynamic Page Generation Time: Slow database queries are a common cause of high TTFB on sites with large content libraries or complex page builder implementations.
Hosting upgrades are often the most cost-effective performance improvement for sites with fundamentally slow server response times. No amount of client-side optimization can compensate for a server that is too slow to deliver HTML promptly.
Third-Party Script Audit and Removal
Audit all third-party scripts on the site, quantify their performance cost, and establish a formal approval policy for any future script additions that includes performance impact evaluation.
- Quantify Each Script's Performance Cost: WebPageTest's connection blocking feature allows you to test the page with individual scripts blocked, revealing the precise performance cost of each one.
- Remove Redundant and Unused Scripts: Most sites accumulate scripts from past marketing experiments, old integrations, and abandoned tools; a post-launch audit typically finds scripts that can be removed without any functional impact.
- Consolidate Analytics Into Fewer Tools: Multiple overlapping analytics tools, Google Analytics plus HubSpot plus a CRM tracker, can often be consolidated to achieve the same data with fewer performance impacts.
- Establish a Script Addition Policy: Any new third-party script should require performance impact testing and explicit approval before being added to production; no ad-hoc script additions should go directly to the live site.
Use the post-launch redesign checklist as the framework for conducting a systematic third-party script audit after launch. Making it a scheduled quarterly process prevents script accumulation from recurring.
Monitoring Page Speed After Launch
Performance is not a one-time optimization. Every content addition, script installation, and plugin update has the potential to introduce performance regressions. Ongoing monitoring is required to maintain Core Web Vitals compliance after launch.
Setting Up Core Web Vitals Monitoring in GSC
The Search Console speed monitoring through the Core Web Vitals report provides field data from real Chrome users, showing which specific pages have poor, needs improvement, or good scores based on actual user experience.
- GSC CWV Report Shows URL-Level Problem Pages: Rather than an aggregate site score, the GSC report identifies specific URLs with poor performance that require investigation.
- Field Data Reflects Real User Conditions: CrUX data in GSC reflects actual user experience across all connection types and device categories, not a synthetic test environment.
- 28-Day Data Window Smooths Variation: The CWV report uses a 28-day rolling window, which means score changes take time to propagate; test on staging before launch rather than waiting for GSC to reflect post-launch changes.
- Email Alerts for New Issues Are Available: Google Search Console can send email alerts when new Core Web Vitals issues are detected; enable this for immediate notification when content or code changes introduce regressions.
Setting up GSC monitoring before the site launches enables comparison of pre-redesign and post-redesign field data, the only way to definitively determine whether the redesign improved or degraded real-user performance.
Using Chrome User Experience Report (CrUX) Data
CrUX data reflects real user experience across connection types and devices, which sometimes differs significantly from lab-based Lighthouse scores that use controlled conditions.
- CrUX Requires Sufficient Traffic Volume: Pages with very low traffic may not have enough CrUX data to report in GSC; use Lighthouse for smaller sites or individual pages without CrUX data.
- Origin-Level vs. URL-Level Data: CrUX provides both origin-level data (aggregate across the entire site) and URL-level data for pages with sufficient traffic; use both perspectives for a complete picture.
- Mobile and Desktop CrUX Are Reported Separately: Performance improvements on mobile that do not correspond to desktop improvements, or vice versa, are visible in segmented CrUX data.
- CrUX API Enables Custom Monitoring Dashboards: The CrUX API allows pulling performance data into custom dashboards or monitoring tools for organizations that need more granular tracking than GSC provides.
Understanding the relationship between lab performance scores and CrUX field data is the core skill for post-launch performance monitoring. Discrepancies between the two reveal performance conditions specific to real users that synthetic tests cannot replicate.
Establishing Performance Budgets
Performance budgets define maximum thresholds for LCP, page weight, total JavaScript size, and total image weight. When content or feature additions push past these thresholds, they trigger a review before shipping.
- LCP Budget of Under 2.0 Seconds Provides Buffer: Setting an internal budget 20% below the Google "good" threshold ensures that normal variation does not push pages into the "needs improvement" range.
- JavaScript Budget Prevents Script Accumulation: A maximum total JavaScript budget per page, typically 300-400KB parsed, creates a forcing function for removing older scripts before adding new ones.
- Image Budget Defines Per-Page Maximum: A maximum total image weight per page, such as 1MB, prevents the gradual accumulation of unoptimized images that degrades performance over time.
- Performance Budget Enforcement Requires Tooling: Manual budget tracking is unreliable; tools like Lighthouse CI, Caliber, or SpeedCurve automate performance budget monitoring against each code deployment.
Performance budgets are the organizational mechanism that prevents performance debt from accumulating after launch. Without them, the performance improvements made during a redesign erode within months as new content and features are added.
Conclusion
Page speed is not a post-launch optimization task. It is a design and development constraint that must be defined before the first wireframe is drawn and enforced throughout every stage of the redesign project.
Teams that treat performance as a launch gate rather than a launch variable consistently ship sites that maintain their performance after they go live.
Run PageSpeed Insights on your current site's homepage and three key landing pages today and record those scores.
You need those pre-redesign performance baselines before your project begins, they are the only way to prove the redesign improved what it should have.
LOW/CODE Agency Builds for Performance, Not Just Appearance
A website redesign that looks great but performs poorly has failed its primary business objective. LOW/CODE Agency is a strategic product team that treats Core Web Vitals benchmarks as design requirements, not post-launch optimizations.
We set performance targets during discovery, build to those targets during development, and verify against them before launch on every project.
- Performance Benchmarks Set During Discovery: We document pre-redesign Core Web Vitals scores and establish target scores that the new site must achieve before launch approval.
- Image Optimization Standards Built In: WebP format, lazy loading, srcset responsive delivery, and explicit dimension declarations are standard practice on every LOW/CODE Agency project.
- Third-Party Script Audit at Project Start: We audit and classify all existing scripts before the redesign begins and establish an approval policy for any new script additions during the project.
- Mobile-First Performance Testing: We test Core Web Vitals on mobile devices and simulated mobile conditions throughout development, not only in desktop browser environments.
- Render-Blocking Resource Elimination: We audit and eliminate render-blocking CSS and JavaScript as part of the standard development QA process on every project.
- Post-Launch Monitoring Setup: We configure Google Search Console Core Web Vitals monitoring and establish performance budgets before handing off the project to the client.
- Performance Budget Documentation: We document the performance budget for each page template and provide guidelines for maintaining those budgets as content is added after launch.
LOW/CODE Agency has delivered 450+ products for clients including Coca-Cola, American Express, Sotheby's, Medtronic, Zapier, and Dataiku. We bring the same performance discipline to every website engagement.
Explore our fast website redesign services or Start with a scoping call to discuss your site's performance requirements.
Last updated on
July 10, 2026
.










