Making FPS game with Electron client and PHP server is an interesting choice of technologies to say the least.
There are definitely issues with getting fine grained memory control in a performant manner but for general processing it's pretty competitive.
Server UDP:
https://github.com/solcloud/Counter-Strike/blob/7dab1533ec4d...
Client Websocket:
https://github.com/solcloud/Counter-Strike/blob/7dab1533ec4d...
I guess if the client is Electron, they're stuck with the web stack.
I don’t see any correlation.