Get the pack from a reputable source like GTA5-Mods.com .
Many mods require OpenIV. Install the ASI Loader and OpenIV.ASI through the Tools menu. GTA 5 FPS Booster MOD Pack | How To Increase FP...
Mods that replace your visualsettings.dat file via OpenIV can remove performance-heavy effects like excessive bloom and fog. Get the pack from a reputable source like GTA5-Mods