I experiance bad lag on preview and the time line as it moves in surges.
yes editing multi cam 4 sony ex1 mxf footage, ACHD and m2t HVR V1e
I have 2 nvidia 580gtx with 3gb dd5 ram each! 6GB in sli 1024 cuda cores.
have i7 980i hex core 4.1ghz rendering on 12 threads.
12gb ram
project lenght 2.45 hrs
render time GPU 3.50hr CPU with GPU accelaration turned off 1.56hr
very buggy want my money back!