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Alright. Here it is in list format
THe program = Premier elements 9 ver 22.214.171.124
The imported Files: 1X 1080i HD mp4
7X 720 HD mp4
Source: HDMI input
Computer: Windows 7
500GB free space of 1TB
2 dual core i7 processers
Graphics Card: Geoforce GT 650M
I usually run PE9 in the background while using other applications like chrome, Game Capture, or even League of Legends, while it is publishing a video.
This problem is consistent, and has been observed on other computers i have used, though the specs for these others computers i cannot access.
If any additional info is needed let me know.
With a 10 hour timeline, even if you have a monster computer, with plenty of HDD space, I would start the Share/Export in the evening, and let it go, without any other programs, or processes running.
Especially when handling H.264 material, it is very CPU intensive, and other programs and processes WILL take CPU cycles, during the processing.
Also, PrE does not do that well, when mixing formats in one Project. PrPro CS 6, with CUDA/MPE processing does a much better job with mixed Source Files.