Have recently run into an issue that has made one of my favourite servers unplayable. Basically some Cars/Players/NPCS will enter a constant appear and disappear mode and the games frames will lower to a point of unplayability. Have been playing FiveM solid for the last year and a half and it has only just started happening.
Heres some fixes I tried:
Redownloaded Cached Assets
Upgraded Graphics Drivers
Verified GTA Files
Optimised PC for play.
Here is said issue in two separate videos:
Clip 1:
Does this issue occur on other servers too? If not, it is most likely occurring because of a server resource - the solution would be to contact the developer(s) of your favourite server and ask them to look into the matter.
Your best bet is to reach out to the developer(s) and have this discussion with them, I don’t think anybody else can really help you with this as it is a server related problem.