In my experience, the electron overhead is relatively negligible compared to the ressource usage of the language servers. And zed seems to use the same language servers.
It is certainly true that the language servers have the same speed in Zed, but there is something to be said for just never suffering from any UI delay for any reason.
Though I'll admit a LS that takes three seconds to respond is kinda indistinguishable from UI delay.
What kind of codebases do you work with? Other than with multi-MB files or thousands of multi-cursors, I've never had any performance issues with VS-Code. It's actually one of the fastest Electron apps, I would say. If I notice a delay, it's usually the language server or some support package's background command taking a bit of time.
If all you know is VS Code it probably feels fine and you should definitely not try Zed - "one of the fastest Electron apps" isn't exactly a ringing endorsement.
I have used both unbearably slow IDEs like Visual Studio, Android Studio, Atmel Studio and very fast and lightweight editors like Notepad++ and Sublime Text.
I don't have any issue with the speed of VS-Code on my machine and it feels the same as Sublime Text used to.
