Performance
Core Web Vitals stop being a local problem once you sell globally.
A site that scores well in Lighthouse from a lab in the same city as your server can still feel sluggish to a visitor eight thousand kilometres away.
8 min
Distance is a real, physical cost
Every round trip between a browser and an origin server takes time proportional to distance, no matter how well the code is written. A single-region server means visitors on other continents pay a latency tax on every request before any rendering even starts.
This shows up most in Largest Contentful Paint and Time to First Byte, both of which are sensitive to that initial round trip. No amount of image compression fixes a server that is simply far away.
What edge delivery actually changes
Serving static assets and, where possible, rendered HTML from points of presence close to the visitor cuts that physical distance dramatically. A visitor in Manila hitting a node in Singapore gets a very different experience than one hitting a server in Virginia.
Edge delivery does not fix a bloated JavaScript bundle or an unoptimised image. It fixes the distance problem. Both matter, and treating them as the same fix is a common mistake.
What to actually check before you invest
Test your site from multiple real locations, not just your own office, using tools that let you choose test regions. If your Time to First Byte differs by more than a few hundred milliseconds between regions, that is a distribution problem, not a code problem.
Check whether your current host actually offers edge rendering or only edge caching of static files. The two get marketed with similar language but solve different parts of the problem.
Sequencing the fix
Fix the distribution layer first if your audience spans continents, then go after bundle size and image weight. Doing it in the reverse order means re-testing everything once you migrate hosting.
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