Low fps on win10 vm gpu passthrough with rtx2060s

3dmarks score is pretty normal, but in-game performace is really bad. I can only get about 50% fps compared to win10 host, and with MSI Afterburner i can see that GPU load is not high, only about 50-60%. What could be the problem? Thanks.
I have tested CPU and memory in vm already and it seems like my cpu and ram aren’t bottleneck