Technical insights on web performance, automatic optimization, and the engineering behind ModPageSpeed 2.0.https://modpagespeed.com/https://modpagespeed.com/blog/fix-cls-aspnet-core-2026/https://modpagespeed.com/blog/fix-cls-aspnet-core-2026/How to fix CLS on ASP.NET Core: pre-size async view components, persist image dimensions, reserve banner space, rewrite img tags via middleware.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-cls-nginx-2026/https://modpagespeed.com/blog/fix-cls-nginx-2026/How to fix CLS on nginx: rewrite img tags to add width/height, reserve container space, use aspect-ratio, ship dimensions at build time.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-cls-magento-2026/https://modpagespeed.com/blog/fix-cls-magento-2026/How to fix CLS on Magento: tame Fotorama gallery jumps, pre-size mini-cart and private-content blocks, rewrite img dimensions at the server layer.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-cls-woocommerce-2026/https://modpagespeed.com/blog/fix-cls-woocommerce-2026/How to fix CLS on WooCommerce: stop the gallery shift, lock variation swap dimensions, reserve cross-sell space, and rewrite img tags at the server.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-cls-wordpress-2026/https://modpagespeed.com/blog/fix-cls-wordpress-2026/How to fix CLS on WordPress: diagnose the shifts, set width/height on every image at the server layer, lock down fonts, reserve banner space.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/aspnet-core-image-optimization-c-sharp/https://modpagespeed.com/blog/aspnet-core-image-optimization-c-sharp/Serve WebP and AVIF from ASP.NET Core with no controller changes. WeAmp.PageSpeed middleware does content negotiation, viewport sizing, and LCP preload.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-inp-aspnet-core-2026/https://modpagespeed.com/blog/fix-inp-aspnet-core-2026/How to fix INP on ASP.NET Core: Razor + jQuery responds well to bundling and the WeAmp.PageSpeed middleware; Blazor Server INP is architectural and needs WASM.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-inp-magento-2026/https://modpagespeed.com/blog/fix-inp-magento-2026/How to fix INP on Magento: the high-leverage fix is theme architecture (Hyvä), not a server-layer rewriter. What ModPageSpeed can do, and what it cannot.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-inp-nginx-2026/https://modpagespeed.com/blog/fix-inp-nginx-2026/How to fix INP on nginx: a CMS-agnostic guide. Server-layer JS minification helps if your JS is bloated; if your stack is already lean, the wins are upstream.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-inp-woocommerce-2026/https://modpagespeed.com/blog/fix-inp-woocommerce-2026/How to fix INP on WooCommerce: server-layer JS minification reduces the parse cost, but cart and variation handlers are architectural. The plan inside.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-inp-wordpress-2026/https://modpagespeed.com/blog/fix-inp-wordpress-2026/How to fix INP on WordPress: diagnose the responsible interaction, defer non-critical JS at the server layer, then trim plugin handlers and jQuery.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-lcp-aspnet-core-2026/https://modpagespeed.com/blog/fix-lcp-aspnet-core-2026/How to fix LCP on ASP.NET Core: async view components, cached static files, and the WeAmp.PageSpeed middleware. Practical steps for Razor Pages and MVC in 2026.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-lcp-magento-2026/https://modpagespeed.com/blog/fix-lcp-magento-2026/How to fix LCP on Magento: tame the RequireJS waterfall, regenerate catalog images, inline critical CSS at the server. Step-by-step for Magento 2 in 2026.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-lcp-nginx-2026/https://modpagespeed.com/blog/fix-lcp-nginx-2026/How to fix LCP on nginx: HTTP/2, gzip_static, TLS resumption, and the ModPageSpeed rewriter. Stack-agnostic LCP fixes that work behind any backend in 2026.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-lcp-woocommerce-2026/https://modpagespeed.com/blog/fix-lcp-woocommerce-2026/How to fix LCP on WooCommerce: shrink the product gallery, kill cart-fragments on non-shop pages, and rewrite images at the server. Practical steps for 2026.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/fix-lcp-wordpress-2026/https://modpagespeed.com/blog/fix-lcp-wordpress-2026/How to fix LCP on WordPress: diagnose the hero, inline critical CSS at the server, convert JPEG to WebP, and verify in Search Console. Step-by-step, 2026.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/google-dl-ssl-mod-pagespeed-download/https://modpagespeed.com/blog/google-dl-ssl-mod-pagespeed-download/Google's dl-ssl.google.com URL historically served the 2020 mod_pagespeed .deb. Years later, it's an unmaintained binary. Here's where to get a maintained build.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/mod-pagespeed-deprecated-2026/https://modpagespeed.com/blog/mod-pagespeed-deprecated-2026/Yes, mod_pagespeed is deprecated. The 1.13.35.2 binaries still run but have not received security updates in years. Here's what to use instead on Apache, nginx, IIS, and ASP.NET Core.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/server-side-critical-css-nginx/https://modpagespeed.com/blog/server-side-critical-css-nginx/Generate and inline critical CSS at the nginx layer for any backend (PHP, Rails, Django, ASP.NET, Go). No WordPress plugin. No headless browser.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/run-with-docker-compose/https://modpagespeed.com/blog/run-with-docker-compose/A working docker-compose.yml for ModPageSpeed 2.0 on nginx: worker + module + shared Cyclone cache volume. Verify with curl, apply a license, done.Wed, 20 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/mod-pagespeed-1-1-release/https://modpagespeed.com/blog/mod-pagespeed-1-1-release/mod_pagespeed 1.1.0 ships 765 first-parent merges since 1.14.36.1 — image-decoder hardening, a full sanitizer matrix, a current dependency graph, and the IIS port folded into the C++ tree.Sun, 17 May 2026 00:00:00 GMThttps://modpagespeed.com/blog/mod-pagespeed-alternatives/https://modpagespeed.com/blog/mod-pagespeed-alternatives/Google mod_pagespeed and ngx_pagespeed are no longer actively developed. Two actively developed successors exist — here is how to choose.Mon, 16 Mar 2026 00:00:00 GMThttps://modpagespeed.com/blog/aspnet-core-middleware/https://modpagespeed.com/blog/aspnet-core-middleware/ModPageSpeed 2.0 as ASP.NET Core middleware via NuGet. Same optimization pipeline — images, CSS, JS, critical CSS — integrated with two lines of C#. No nginx required.Thu, 12 Feb 2026 00:00:00 GMThttps://modpagespeed.com/blog/migrating-from-1x/https://modpagespeed.com/blog/migrating-from-1x/Step-by-step guide for migrating from mod_pagespeed 1.x or ngx_pagespeed to ModPageSpeed 2.0. Configuration mapping, Docker Compose setup, and verification checklist.Tue, 10 Feb 2026 00:00:00 GMThttps://modpagespeed.com/blog/critical-css-heuristics/https://modpagespeed.com/blog/critical-css-heuristics/Generate critical CSS without Puppeteer or headless Chrome. ModPageSpeed uses heuristics in under 5ms per page — no Node.js required.Sun, 08 Feb 2026 00:00:00 GMThttps://modpagespeed.com/blog/economics-of-image-optimization/https://modpagespeed.com/blog/economics-of-image-optimization/Cost model for image optimization at 100K to 10M monthly requests. CDN pricing scales linearly; self-hosted is flat. Break-even sits around 300K requests/month.Sat, 07 Feb 2026 00:00:00 GMThttps://modpagespeed.com/blog/save-data-bandwidth/https://modpagespeed.com/blog/save-data-bandwidth/How ModPageSpeed 2.0 respects the Save-Data HTTP header to serve lighter image variants. Typical 30-50% additional bandwidth reduction on top of format and viewport optimization.Fri, 06 Feb 2026 00:00:00 GMThttps://modpagespeed.com/blog/benchmarking-real-numbers/https://modpagespeed.com/blog/benchmarking-real-numbers/ModPageSpeed 2.0 benchmarks across e-commerce, blog, news, and portfolio sites. Real LCP, FCP, and Lighthouse improvements on 3G, 4G, and broadband — methodology included.Thu, 05 Feb 2026 00:00:00 GMThttps://modpagespeed.com/blog/viewport-aware-image-optimization/https://modpagespeed.com/blog/viewport-aware-image-optimization/How ModPageSpeed 2.0 converts images to WebP and AVIF on nginx using a 32-bit capability mask. One decode pass, up to 37 variants per image.Tue, 03 Feb 2026 00:00:00 GMThttps://modpagespeed.com/blog/hello-world/https://modpagespeed.com/blog/hello-world/The story behind ModPageSpeed 2.0 — why mod_pagespeed is no longer actively developed, what was kept from PSOL, and how a new architecture replaced the RewriteDriver.Sun, 01 Feb 2026 00:00:00 GMT