It actually behaves surprisingly well when you just scroll with the spacebar, as I always do[1].

[1] note: using this method (spacebar to jump one screenful, and shift-spacebar to go back up) on sites that insist on doing the "sTiCkY hEaDeR" idiocy results in losing a line or two on every page, so, I guess, don't get too used to it as it's hard to use today.