Studies on user behaviour consistently show visitors abandon a page if it takes more than a few seconds to load, and each additional second of delay measurably increases the number of people who leave before they've even seen your content. Speed isn't a nice-to-have — it directly affects how many visitors turn into customers.
Google also uses page speed as a ranking factor. Two sites with equally good content can rank differently in search results purely because one loads faster than the other.
| Factor | Plain English |
|---|---|
| Response time | How long the server takes to start sending the page after a request — the foundation everything else builds on. |
| Page size | The total weight of the page — heavier pages take longer regardless of connection speed. |
| Compression (Gzip/Brotli) | Whether your server shrinks files before sending them, similar to zipping a file before emailing it — often cutting page weight by 60-80%. |
| Cache headers | Whether returning visitors' browsers are told to reuse files they already downloaded, instead of re-downloading everything on every visit. |
| HTTP/2 support | A modern version of the web's core protocol that lets a browser fetch many files from your server at once, instead of one at a time. |
| HTTP/3 support | The newest protocol version, advertised via the Alt-Svc header — faster connection setup, especially on unreliable mobile networks. |
| CDN cache status | Whether your CDN/cache layer is actually serving cached content (a HIT) rather than just having caching policy declared but never actually working. |
| Render-blocking resources | Synchronous scripts and stylesheets in your page's <head> that delay the browser from showing anything at all until they finish loading. |
Most of these are one-time server or hosting configuration changes rather than ongoing work: enabling compression, setting sensible cache lifetimes, and switching to a host that supports HTTP/2 and HTTP/3 by default (most modern hosts, including Kinsta and WP Engine, already do). For render-blocking resources, add async or defer to non-critical scripts. For resource weight, compressing images and lazy-loading anything below the fold makes the single biggest visible difference.
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