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Ok, just throwing a couple of things your way. i5 is on the low end to video edit HD video. You can get away with no shadow files so long as you don't become silly with the additions you add to your video track.
Frame rate of capture using Bandicam - yeah, but what about the bitrate you've selected? If you're way too high and are using the avi container, the video is going to be massive and a mammoth file for you to process - audio/video synch issues.
Mix matching frame sized video can be difficult for the processor/gpu to handle on the fly - you need to alter your approach, even produce the lower frame size to up it to match the higher or other way around.
The software can handle 4K IF your computer can. Members have come up with a suitable fast 4K editing method of their own - check out the forum headers.
1. Shadow files must be fully created before any editing is started.
2. Preview in non-real time - might help with video but audio is not active.
The preview audio video sync issue to me is related to the files bitrate and your computer is struggling to process the data in real time. Your only option might be to go the shadow file route - not one I'd want to go - much lower res video to edit with.
Just a guess and an opinion.
Dafydd