I have the same Problem here.
I got bad FPS since the last Patch. Befor everything was more or less fine now it runs like crap...
FPS drops down to ~17fps and some complete sceeen freezes for about 5-10 sec.
Sys Spec:
AMD Phenom2 x6 1090T (3.2ghz)
Geforce GTX560TI OC (1gb GDDR5)
4 GB DDR3
Windows 7
What i did:
Defrag
Checking for Driver Update
Tweaking Arma 3 (CPU count, Ram and so on)
Close everthing thats not needed for Arma 3 (Like skype, Teamspeak, Antivirus Software, windows Services...)
Nothing seems to improve the performance.
So its right to say one step forward 2 steps back... It has the feeling of going back to the "good" old Arma 2 Days... I tought u have learned from that BI ... :(