From day to night, I started to have massive LOD issues. Includes +20sec to start playing a replay and a whole stunt to load the map properly, which makes it impossible to even watch something without being disgusted.
nVidia drivers
Anisotropic = 16X
All set to performance.
Also, could it be something related to my HDD? It's not 100% full as other videos I edited, but maybe it just takes long to find texture files?