You can use the goto line function to avoid scrolling and you dont have to click and drag the selection, just click once:
Cursor in the top left.
Control + G = goto line 33000
SHIFT+ALT+LEFT CLICK bottom right column of line 33000?
Edit: Oh apparently that moves the cursor when you goto line. You could go to line 33000, place the cursor at bottom right then grab the slider to put it line 1, then shift+alt+click at top left.