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Which output profile are you producing to? Have you tried extracting the audio from your source clip (available when right-clicking on it in the Media Library) and only placing that on the timeline, with no other content?
Output to: Wma, Audio 8 for dial-up modem (mono,28.8 Kbps)
Tried the origional source with video removed and it took 2:36:00
The produced videos are each produced from 3 4K cameras with the audio usually from the front closest camera. The final videos are produced down to 1920x1080 15540kbps, 29.97 frames/sec. This video is then loaded alone and only the sermon is produced to WMA mono, 28.8 Kbps.
When this slows down the computer is pretty much not doing anything except rendering the audio and sometimes the resource monitor to see what is going on. The above origional source was running only PD18.