I recently shot and edited this music video for a client: 
It was shot with a Panasonic GH2 and edited in Vegas Pro 10. Effects used were from Sony, NewBlue, and ProDad Vitascene.
While editing, I learned a few things about working with multiple effected HD tracks. One of the more surprising discoveries I stumbled upon was that by explicitly soloing the tracks I wanted to include, as opposed to muting unwanted tracks, previews seemed to play slightly smoother and renders took slightly less time. I didn't make a scientific study of it, so I can't vouch for this with certainty, but it was noticeable enough for me to always be sure to keep my relevant tracks soloed, even when any unwanted tracks were buried many layers deep and not visible anyway. I'd be curious to know if anyone else has noticed this phenomenon.
Bear in mind, I'm still using an old 32-bit quad-core machine. This particular project required lots of effected layers (the miniature band at the bottom of the screen alone, is a composite of 5 separate green screen tracks) definitely convinced me that it's time to invest in some new hardware.

It was shot with a Panasonic GH2 and edited in Vegas Pro 10. Effects used were from Sony, NewBlue, and ProDad Vitascene.
While editing, I learned a few things about working with multiple effected HD tracks. One of the more surprising discoveries I stumbled upon was that by explicitly soloing the tracks I wanted to include, as opposed to muting unwanted tracks, previews seemed to play slightly smoother and renders took slightly less time. I didn't make a scientific study of it, so I can't vouch for this with certainty, but it was noticeable enough for me to always be sure to keep my relevant tracks soloed, even when any unwanted tracks were buried many layers deep and not visible anyway. I'd be curious to know if anyone else has noticed this phenomenon.
Bear in mind, I'm still using an old 32-bit quad-core machine. This particular project required lots of effected layers (the miniature band at the bottom of the screen alone, is a composite of 5 separate green screen tracks) definitely convinced me that it's time to invest in some new hardware.