I have the problem that despite good measured internet, in all online games I have internet laggs. The worst thing is with GTA Online, where players teleport around me, bugging through the floor or cars appearing out of nowhere. But also in CS: GO other players jerk slightly despite a permanent 20ms ping. Or in Minecraft servers, where I'm always reset when I run. This is not always the case, but mostly and with offline games I have absolutely no problems. When I do speed tests, it always shows normal good internet (30-45mbits) and a ping of around 20ms. These problems also came out of nowhere, a few weeks ago, without changing anything on my hardware. I also uninstalled and reinstalled my network card in Windows, after which it was better for a short time.
Ryzen 5 1600 @ 3.7 Ghz
Radeon RX 5700 XT
MSI B350 M Pro-VDH
Windows 10 1909
Install old / new network driver?
Uninstall last Windows 10 update?
Disable firewall?
Unfortunately, everything does not help