We have 2 almost identical computers (i5 processor, windows/10, 4 Gb memory) and both run AVs4U video editor 7. The computer with the standard graphics board runs fine but when we mute audio, cut a video or edit a scene, the first second of the video become slow (like the computer or grahpics board is not hanling it anymore). The computer however has a Geforce GTX 960 grahpics boiard - a very powerful gaming card.
So we import a video (1080i from Gopro hero4), we bring it to the storyboard and it runs fine. Than we mute the audio and the first 2-3 seconds give the problem.
Even if I remove the audio from the video first and then import - samen problem. Unmuted no problem, mute on - problem.
Same when we cut a video, the first few second of the second part are bad.
Any suggestions?