Recently I edit a project containing so many video tracks (I called this 'Vertical timeline project'), because I must took so many clips from other 'complete' project.

Really not fun working on this, because not just the need to slide top-down on the timeline, but also being troubled with so many crashes during playback. Try to patient with these crashes..., but I finally reached my limit of patience....

Source media:
AVCHD 50i, HDV 50i via HVR-MRC1K CF recorder, and one shot of XAVC 720-100p

*Well, if SCS developers may receive so many recent crash reports with 'Playback crashes' or similar reason, that's from me....