Tubemate YouTube videos lag

[loukaskork1]

2k webm and 1080mp4 videos has lag they doing some stops(tubemate app YouTube videos) when playing with VLC.Also there is problem with playback line when you try to progress 2k webm tubemate YouTube videos.This stucks sometimes.With others players(xplayer or mx player) this doesn't happens .New Pipe app 2k webm YouTube videos works fine with Vlc .Also smi(mechanical translated YouTube greek subtitles) files run very quickly i can't read.Please fix these problems.