Just in case if someone have\had the same problem.
I finally managed to fix it. I gave up a long time ago, but then i returned to this problem and spent like two full days, trying all possible and sometimes really stupid solutions. Including Disney and GoG techsupport.
Long story short: it happens when you connect to the server with 20\30 TPS without /framelock option, so game runs on 60FPS, server runs on 30 (or 20) TPS, game tries (i assume) extrapolate this (like, 30TPS logic to 60 FPS output) and we have such problems like mouse deceleration, glitches with grenades etc. So, game won't allow you to set TPS tru interface, so you have to use comman line or SWBFspy software (as i did). Because, well, game lets you create server only with TPS=20 with no options to change that.
Solution is simple yet tricky: you have to start the game with /framelock parameter, so you will be forced to play with FPS=TPS of server. Another workaround (if you don't wanna play with 30 FPS) is to create server with 60TPS while use /framelock,
Hope this helps.
I finally managed to fix it. I gave up a long time ago, but then i returned to this problem and spent like two full days, trying all possible and sometimes really stupid solutions. Including Disney and GoG techsupport.
Long story short: it happens when you connect to the server with 20\30 TPS without /framelock option, so game runs on 60FPS, server runs on 30 (or 20) TPS, game tries (i assume) extrapolate this (like, 30TPS logic to 60 FPS output) and we have such problems like mouse deceleration, glitches with grenades etc. So, game won't allow you to set TPS tru interface, so you have to use comman line or SWBFspy software (as i did). Because, well, game lets you create server only with TPS=20 with no options to change that.
Solution is simple yet tricky: you have to start the game with /framelock parameter, so you will be forced to play with FPS=TPS of server. Another workaround (if you don't wanna play with 30 FPS) is to create server with 60TPS while use /framelock,
Hope this helps.