6 ms·

My laptop noticed, and started its fan singing in praise. Had to go into reader mode to pull Firefox down from 50% CPU.

• biot 11y ago
  Maybe that's a Firefox bug? Not having to redraw a section of the screen should consume less CPU, not more.
  • Raphmedia 11y ago
    If it's done wrong, it may reposition itself every millisecond while you scroll, which could make it a pain for your browser's performance.