Cod4 Mac fullbright

I have used the search bar, googled this topic a TON and still nothing. I currently have literally every console setting turned to give best FPS. All I am asking for is stable fps above 75. The only way I have found to enable fullbright on a mac is advantage tool. I WOULD buy it ONLY for fullbright but it's 10 dollars a month. So I am wondering, is there a way I can enable fullbright on a mac without constantly paying? Is there an equivalent to iw3mp.exe for mac? It does not matter to me if it is a detected thing or not, I just need to get the FPS. Any help appreciated. Do not say buy a new computer as I cannot do that until a few months from now.