I made a video of my laggy minecraft performance. You can see the twichy performance especially in the beginning of the video.
Note that I also have lag in roblox, BUT not in Overwatch or any other games(steam or Epic games).
I have met the brick wall. What on earth could do this?
I have Ryzen 3 2200G with Asrock 350M, 1050Ti, 16MB.
I have tried different refresh rates, cables, monitors, minecraft versions, java versions, memory chips, memory banks, gfx, windows 10 reinstall, bios updates, mb chipset drivers.
I figured it out. FInally. My Ducky Shine3 keyboard's key repeat rate was accidentally much much too high(settings are in the keyboard itself). Returned default settings, all is fine again.