I need some help with this, or more like some sort of confirmation because I'm at the point where i don't even know anymore. I've been a windows user from 2005-2015, fast-forward its 2016 and now I'm using a Linux desktop, id like to think I'm at the newbie-intermediate range because i know a lot of things, the Linux Distro i use its an arch derivative called Manjaro, i started using the xfce version and now i have around 3 months using the base install. Now, where the issue lies is in the video games. I use wine for like 4 games that i deemed important, and for everything else i got a Linux version if there was. The issue is that for the Linux versions of these games, i get significantly low performance,and games that would just perform better on windows (~60fps) would performed mediocre on Linux, I understand that Linux is different than windows, but this is just unacceptable.. is there something I'm doing wrong?? These are my specs ( and BTW, this is all i got, if I could i would get something better. )

AMD Phenom II x4 @ 3.40ghz BE
AMD Sapphire HD7850 2GB OC Edition (DDR5 or GDDR5 idk i forgot)
Asrock A785gxh/128M
8gb ddr2 (800mhz)
~ 2.5Tb total space from all disks
1 ADATA SP900 60gb SSD for OS
Manjaro x64 (Base)

*** GPU: Mesa with lib32 enabled ***
I'm not using catalyst because i get HORRIBLE performance even on the desktop -_- compared to what a desktop is supposed be like in terms of performance..