The patch that came out about an hour ago has made Rust run horrible on my computer. The choppiness and stuttering is constant from the moment I join a server. The game has run extremely well on my computer since the update on Thursday, even with all the different patches that came out after. Something about this particular patch has broken the game for me though. My specs: Windows 7 64 bit installed on seperate 120 GB SSD, i5-2500k overclocked to 4.2 GHz, ASUS P8Z68-V LE motherboard, 8 GB 2133 MHz RAM, and EVGA Nvidia GTX 780 with latest drivers (355.98). I hope this info helps.
EDIT: Sorry, false alarm. It must have been the server messing up, because it is running great now.