I just went and found a random wikipedia article that was really long (52,000 characters) and clipped the whole thing into QC, and opened it in the viewer. It took 22 seconds to scroll from top to bottom holding the page down. I opened the same file in Tear, not the webpage but the actual clipped .txt file, and it took well over a minute to scroll from top to bottom (because I had to keep flicking it).

I know I could've dragged the normal gtk scrollbar in Tear to go anywhere instantly, but you can switch QCV to gtk scrolling too (but it won't do both).