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Page speed optimization: compression, caching, lazy loading, CDN.
51 articles tagged Performance
How to find outdated SEO tags after a release: compare HTML and X-Robots-Tag, distinguish browser cache from CDN cache, and confirm the fix with repeat requests.
How to connect a layout shift to font loading, compare the fallback and primary fonts, and check text wrapping, buttons, and zoom after changing CSS.
How to measure DNS, connection, TLS, and time to first byte during a timeout, record the time and error, and send your hosting provider the details needed to check server logs.
How to find the actual URL selected for a broken photo, check the CDN response and source file, fix the path, and keep thumbnails and the gallery working.
How to compare card width, screen density, and the selected file, configure srcset and sizes, and reduce downloads while keeping photos sharp and available in a larger view.
How to identify a product page’s LCP element, understand delays in the main photo request, configure its loading and priority, and keep the rest of the gallery slides working.
Configure Next.js 15 to update after a product is edited in the CMS: explicit caching, a verified webhook, revalidatePath, and checking the page’s new version after the signal.
How to compare meta tags in the CMS, server HTML, CDN, and browser; find an old page copy; and check the regular guest URL after clearing the relevant cache.
How to check Accept-Encoding and Content-Encoding for HTML and JavaScript, compare with an uncompressed response, find an incorrect MIME type or threshold, and verify decompression.
How to repeat speed measurements with the same network, CPU, screen, and cache settings, compare a series of results, and distinguish lab tests from visitor data.
How to compare the same page with and without chat in a test, find the widget’s requests and costly execution, and check optimizations without losing the needed function.
Open the landing page using the ad link, and check the offer, mobile screen, and form. This checklist helps confirm that the submission reached its recipient before launch.
Open a tool for the task described in the article.