Premiere Pro :: Warp Stabilizer In CC 7.1?

I'm having alot of difficulty with Premiere CC, Warp Stabilizer, and spanned .MTS files.
 
It's a 90-minute production, two cameras, one steady, the other moving. All Panasonic AVCHD, and all continuous recordings, so I have several spanned .MTS clips, that I imported directly into Premiere via the Media Browser. Made my edits, cutting back and forth between the two cameras, and then warp stabilized many shots that were too jittery for my liking. It plays back fine, but takes FOREVER to render(if it doesn't crash, which it often does...I've found that if I render the clips one at a time, it crashes less)...and everytime I click export > media, it crashes. It crashes on any kind of copy and paste operation, so I can't duplicate my sequence, or copy and paste the clips so I can make changes without affecting my original edit. I don't want to mess with the edit and start removing the effect until I have no other option...
 
The edit is finished, I just need to be able to render and export...I *think* this is a warp stabilizer issue. If I start a new sequence and lay down the raw footage, no warp stabilizer effect, it renders/exports without issue.
 
What can I do about this? Would converting the files to Prores solve anything? That would be less processor intensive, right?
 
Would I be better off linking to AE and using the stabilizer in AE? I was doing that at first, but it was time-consuming to go back and forth...
 
System Specs -
 
Late 2012 iMac
3.4 GHz Intel Core i7
16GB RAM
NVIDIA GeForce GTX680MX w/ 2 GB RAM
OSX 10.8.5
Premiere Pro CC 7.1
 
Final note - I do not have CUDA enabled...I don't know much about video cards and all that. CUDA is not an option when I look at my playback options...My current project playback setting is OpenCL How would I enable CUDA.