The process was invented in the 1960s to allow many people to run code on a single mainframe. It was never meant for the lightweight execution model we have with serverless.
Most serverless platforms are built on top of that process-model, giving you cold starts and overhead which translates to cost.
Workers uses Isolates
, a lighter-weight way of securing your code which allows thousands of processes to run happily on a single server.
This allows Cloudflare to deploy your code to every one of our 165 data centers around the world, all for less than other serverless platforms charge you to deploy to one.