No but I tried deleteing the whole thing and re installing.
The widowed mode thing is basically idk why but when im on that mode i get normal fps like I used to before on fullscreen.
I dont know what Vsync is ill check google.
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well one thing that might help is running adwcleaner and malwarebyte. Those will clean most adwares and stuff like that. Some of those can eat your computer sometime, and they are not detected by anti-viruses.
adw-cleaner: https://toolslib.net/downloads/viewd.../1-adwcleaner/
https://www.malwarebytes.org/downloads/
Both programs are free, enjoy. And watch out for bundlewares.
Try using task manager and right clicking the GunZ process, after that select the option "Set Priority" > "High" or "Real Time".
Also try running the game/launcher as administrator? (right click application > "Run as Administrator")