Edge computing for business websites: what it changes and what it does not
What running code at the network edge means for an ordinary business website, where it helps, and where it is marketing.
The short answer
Edge computing means running small pieces of code at the network’s many locations near visitors, rather than in one central region far from most of them. It is useful for decisions that must happen before a page is served or a request is forwarded: redirecting by country or language, adding headers, splitting traffic for a test, checking a cookie or a token, rewriting a path. For an ordinary business website built as static files, it changes less than the marketing suggests, because the pages are already at the edge as files served by the CDN, which is where nearly all the speed comes from. It does not replace a back end or a database, and code at the edge is limited in what it can do and for how long. The sensible pattern is static pages at the edge, a little logic at the edge where it helps, and the back end in a region near the data.
What runs where
| Layer | What it does | Where it lives | Business site relevance |
|---|---|---|---|
| CDN | Caches and serves files near visitors | Every edge location | Essential: it is why static sites are fast everywhere |
| Edge code | Small decisions per request: redirects, headers, geolocation, tests, auth checks, rewrites | Every edge location | Useful for a few things; conveniences for an ordinary site |
| Serverless functions | Dynamic work: forms, API calls, rendering on demand | A chosen region | Needed for the dynamic edges of a site |
| Back end and database | Data, logic, integrations | A chosen region | Needed for applications; placed near the data |
Where it genuinely helps
- Market and language routing: sending a visitor to the right version without a round trip.
- Headers and security policy applied consistently at the edge.
- Redirects at scale after a migration, handled before the origin is involved.
- Light personalisation from a cookie, such as a returning visitor’s preference.
- Traffic splits for a test without client-side flicker.
- Authentication checks in front of protected pages, before the request proceeds.
What it does not change
The need for a back end and a database for anything that stores or computes across users. The importance of image discipline and small JavaScript bundles, which decide more of a page’s speed than where code runs. Data residency, which is about where data rests and is processed, not where a redirect executes. And the basic architecture: a static site with functions for dynamic parts is fast because of the CDN, and edge code is a refinement on top, not the foundation.
What this means for you
Treat edge computing as a useful refinement for a few request-level decisions, not as the reason a site is fast or the way to build an application. Keep pages static at the edge, use edge code for routing, headers, tests and checks where it helps, and keep data-dependent work in a region near the data. A site built that way is fast for reasons that hold up, whatever the platform calls them.
Frequently asked questions
Do we need edge computing for our website?
If the site is static, most of it is already served from the edge as files, which is the main benefit. Edge code adds value for the small dynamic touches: a redirect by country, a header, an A/B split, a check on a cookie before serving a page. For a typical business site those are conveniences, not requirements, and the platform provides them without the site being designed around them.
What is the difference between a CDN and edge computing?
A CDN caches and serves files near visitors. Edge computing runs code near visitors, so decisions can be made before a file is served or a request is forwarded. The CDN is what makes a static site fast worldwide; edge code is what lets a few dynamic decisions happen without a trip to a central server. A site needs the first; some benefit from a little of the second.
Can we run our whole application at the edge?
Parts of it, with care. Edge functions have limits on runtime, memory and what they can connect to, and a database still lives somewhere specific, so heavy or data-dependent work belongs in a region near the database. The pattern that works is static pages at the edge, light logic at the edge, and the back end in a region, not everything everywhere.
Sources
- Cloudflare Learning Center: What is edge computing? (accessed 2026-09-12)