Comment 10 for bug 1494795

Ok, you're misunderstanding the 23% CPU time number i wrote there, it meant "23% of the CPU time spent by the program", not that it is using 23% of the CPU itself.

There's a bit more detailed description of where the CPU usage of vertically scrolling comes from at https://docs.google.com/document/d/1Gf2bRxNc_8R_620o_9J1EZ6GWLGOmNBrvNfLRTLwrqc/edit