I have terrible FPS lags when i start using fullscreen.

[Recreant]

Hello there.
I don't know if i should seek help there, but I have no other idea so let me ask for your help.
When i start ANY tibia client, my FPS and game fluidity seems fine, unless i use fullscreen. And i am forced to use fullscreen ,because i learned how to play only with fullscreen enabled and it allows me to aim my SD's easier (oldschool player here). But when i do that, my game feels like i played with 15-20 FPS when my PC is really good and the problem doesn't really occur until i enable fullscreen. Do you have any idea how to find a solution on this, or is this just some weird problem with my computer?

 

[Catalyst]

Have you checked if you got the latest drivers for your gpu?
Do you put your framerate at the maximum in the tibiaclient? If you do, set a limit to 60-70, thats all tibia needs.
Try changing the graphic options DX9/DX5/OpenGL, Try them all.

 

[Recreant]

I already did, i normally used DX9 and had around 210 fps when it was uncapped, but i always capped it at ~80 fps, also created a shortcut and used Engine 2 Yes, didn't download anything, didn't upgrade my windows to newer version. Problem occured out of nowhere, really. I used to have fluid gameplay a day ago, now it just seems like i play tibia on a computer from 15 years ago. Every other game works as intended, though. Mostly at 200-230 fps.