Nope, I did clean installation with avastclear (safe mode) and through online installation like you mentioned but the problem still persists. Im seriously doubt the lastest version’s web shield was the culprit.

Thank you inojim for your suggestion, disable https scanning did help a little, the videos load more faster but not smooth like previous avast version, btw I’m using chrome and firefox. I hope avast will look into this problem, thank you.

~Vince