Lagg help me thanks

hi all i dont know why but i lag in gears 5 and i play all other game maxed 4k and i have a i9 9900k…rtx 2080 ti FTW3 ultra…32gb ddr4 3200 i try fix issu with nvidia panel changing 3d option for gears5 but dont work…all are updated i see the last Windows 10 1903 build 18362.329 ( KB4512941) can cause problem too and i have this update…xbox beta are updated too but i play gears 5 on steam i need help thank you

and i add i lag with all setting to low in 1080p too i get same fps …1080p low setting 20-30fps…4k ultra setting 20-30fps too