Here you go:
- Vsync messed up for amd graphic users
- FRAME TIME BUG, micro lag, performance issue, video stutter
- [Tutorial] Frametime graph and fps counter with RTSS
I have an rx470 and a ryzen 7 3700x also by the way.
Try to use RTSS to show your frametimes, but get rid of vsync first.
Does it get better temporarly, if you hit alt-enter 2 times to toggle windowed and fullscreen again?