Decent rigs to high-end rigs like mine...let's face facts people...the game is not optimized and until then, the steps mentioned above will improve performance dramatically. I tried forcing the settings all decked out and that's not going to happen on a game that isn't playable with them. We all know how frustrating it is to be waiting for the main issues to be fixed, but until then...do what needs to be done to at least enjoy the game for now. Yes, IW is taking forever, yes this is crap it was launched like this...but either stop playing the game or deal with the issues that are present.
Oh I 'can' get rid of most of the FPS Drops if I want Console rendering and you're still stuck to P2P from some Dude's K-Mart ISP Laggy Lobby, but if I have to stoop to those crappy rendering levels then I might as well toss out my i7-3930K, 32GB RAM, SLI GTX 770's and go buy myself a POS XBone or POS4.
However, even if I render crap then I'd still have to tolerate Hacked & Infested lobbies.
The game is DOA and at this point IMHO IW just needs to drop PC support. IF I could get on a decent Admin (Kick + Ban) Ranked Private Dedicated Server ... then please let me know and send me a PM and I'll be there!