The framerate is not usually an indicator of quality unless it is under 24 fps (frames per second). There are generally three framerates you will encounter more often:
1) 29.97. It's the framerate of NTSC video. NTSC is used in USA and Japan so, anything coming from these places, will be at this framerate.
2) 25. It's PAL and is used in Europe. If you live in US you probably won't see this thing in your life
3) 24. This is the actual rate at which movies are shot and projected in the cinemas. Since you will agree that 24 is different from 29.97 and 25 there should be a "trick" to make all this things coherent between them.
At this point I would suggest you to read a little bit about inverse telecine
to understand what this process is about.
The best suggestion I can give you is, if your footage was first shot at "Film" framerate (24 fps), to inverse telecine
it before editing in Premiere: this will give you the best quality possible.
I still have to understand why Premiere was hanging while you were using 29.97 footage.... hmmm....
You should never underestimate the predictability of stupidity.