Some questions about server maintaining

I’ve been looking for script issues and others problems in my server because after some time, the map stops rendering for some players, players with High-End Setup, and FPS is low for some of they, that’s ocurrs when server is online for more than 5 hours or have more than 64 players, so i’ve some questions:

-Which is the recommended specs for a 64+ players server
-How can i discover buggy and laggy scripts, have a monitor or something?
-FiveM server is recommended to restart at how much hours?
-What can i do to improve FPS?
-What can cause random fps drop?

Make sure you have a decent CPU, or do you mean client specs?

None, fivem servers don’t need to restart.

Check out F8 -> resmon and F8 -> strmem on client, make sure your assets or scripts don’t use ridiculous amount of resources. Also don’t have 100 of vehicles with full HD textures and insane amount of polygons