Serverless everywhere yields apps with massive latency & loading times and if timeouts aren’t well tuned (read: set unreasonably high) you often get dropped connections on api calls. I am currently migrating an app off vercel to raw compute (EC2) and the difference is night and day.
I'm also noting a generic pattern of intermittent response times in pretty much anything serverless.
When you take a traditional tech stack, say LAMP on a dedicated server, performance is very constant overall. You even develop a type of muscle memory for it and adapt a click pace/flow when you use an application like that intensely.
No so much with cloud-native serverless. A page may respond fast and then 10 times slower the next time. There's just so many moving parts (virtualization, edge, cache, cold/warm compute, out of network dependencies, etc) that it feels random to a user.
It's funny that on one hand people are preaching about Time To First Byte and SSR and what not, and on the other people from CF/Vercel and others are massively investing into serverless which almost by definition has to have drastically degraded latency compared to normal apps.
