My problem = Object take 2-3 minutes to load, and, before I could play high + Anti-aliasing, dinamyc light etc. .. But
Now I can play only with medium-low, no anti aliasing, no dinamic etc.
Loading times is especially high when our HW ram is insufficient.
Check the RAM usage using "Ressource Monitor" (Win7 built-in).
Close unneeded programs to free some RAM.
Defragging your HDD should improve performance as well.