What model i7 processor?
Model 2600. Also the graphics card is GT 425M.
I'd expect playback of raw clips to work fine. Are there any effects in play here?
Nope, just importing and playing in the source window or timeline. No effects, transitions whatsoever.
OK, try this.
1. Close PP. Wait a bit for it to leave memory. (Or if already closed, start with 2)
2. Restart PP and create a new, empty project.
3. Go to Edit>Preferences>Media... and take note of where the Media Cache Files are stored.
4. Below that, Clean the Media Cache Database.
4. Close PP again.
5. Delete the Media Cache files from the hard drive using Windows Explorer.
6. Restart PP and open the project you were having trouble with. Let the cache files rebuild before you do anything.
The GT 425M may not be up to the job. Is there any difference when you have MPE hardware on/off?
Also, you could set the adaptive resolution to 1/2 and like get better performance without a perceivable loss in preview quality. That is assuming that you are just previewing on a laptop screen.
-Sorry, just read your post more carefully.
Does your sequence framerate match the footages?
The GT 425M may not be up to the job.
The GPU won't have any effect on simple playback.
I tried what you said and problem still exists.
There is no difference between MPE on or off. Yes, framerate matches sequence.
I do not suspect it is the GPU as Premiere has worked fluidly up until recently.
Is this a dedicated edit rig, or a multipurpose machine?
Multipurpose machine. However, I'm only running a few programs as well as internet.
I frequently defrag, scan for malware, clean out cache files, eliminate unnecessary startups through msconfig, etc...
What baffles me is that even after resetting BIOS to default, reinstalling windows, reinstalling premiere, removing 90% of unnecessary programs, I'm still getting this problem.
Try the other 10% of unnecessary programs.
Perhaps the CPU is in some power saving mode?