[JP Pelc] “- Don’t edit too much H.264. While Premiere can handle it, it’s an inter-frame codec, meaning most frames are referencing another frame 4 or 5 away. This adds to the processing needs. While it’s probably too late for this project, future projects with a decent amount of DSLR footage should have it converted to ProRes 422 before going into Premiere.”
I’m not so sure about that.
I have not had any problems with any codec in the last 2 years of using Premiere,
including H264 footage.
If you have a slower/older system sure, but a fast raid on a recent macpro tower
and a quadro 4000 gpu seems to churn right through it in my experience.