I get 60 FPS smooth for the most part since I only have a 60HZ monitor when I'm playing GTA in story mode WITH Make Visuals Great Again. After I download LSPDFR and all my mods, I get around 50. It looks very choppy when I'm playing, but I have to choice to lock my FPS to 50 with the 50HZ option. The reason for the lag is obviously because of something I downloaded LSPDFR related and I think it's one of my plugins, not my mod itself. If you guys know the mods that cause this, I would love to know. I'm probably guessing they're plugins like traffic policer and arrest manager and I just can't get rid of those. But if it's something I can, I'll do it. Also, I have a GTX 1070, i5 6600k, and 8GB of RAM. I'm running on the Steam version of GTA5 and everything is up to date.
GTA 5 Folder + Plugins: