Pre8 jerky playback in preview window AVCHD files

I am working on a project in Pre8 that uses AVCHD files from a Canon HD camcorder (*.mts files).  I can add files to the timeline, but editing is very difficult because the playback is very jerky in the preview window.
I suspect it may be my machine, as it does not have a video card, but uses the Intel g33/g31 chipset.  I have a few questions:
If I get a video card, will it help with the preview playback?  Recommendations for a card that won't break the bank?
Would Pre9 be any better at handling these files?  Is it a big upgrade from 8?
Thanks for your help!
Tim

Without throwing a ton of money at this situation, what are my best options if I want to edit the AVCHD files?
First will be to add an internal hard drive.
From there, will I see more benefit from adding a video card, or will upgrading to Pre9 be of more use to me?  Does Pre9 natively support AVCHD editing?  I am going to download the trial version to see what happens.
I am also looking into converting AVCHD files to a more easily edited file, but really don't want to add extra steps to my workflow if I can avoid it.

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