Probably because of unoptimized resources. Looks like you didn’t search for what I said earlier this morning so I’ll link it.

Run an ETW trace to find out which resources are causing the lags server side. This will show you the source of the hitch warnings during gameplay.

Client side open the resource monitor by entering resmon 1 in your F8 console. All resources added up should have a latency of max. 4ms.

Edit: Switching to ZAP hosting will not solve your issue.