So I know that it's a much slower system than the Retina machine that I was testing on before, but scrolling performance is almost comically bad on this old MacBook (10.6.8) that I've been testing MC out on the last few days.
While inertia scrolling seems to be causing problems when using a trackpad on newer systems, I'm using a mouse with this system and it seems like MC is not interpreting the scroll commands correctly.
Scrolling seems to either move at a very slow speed: maybe 10px/step, very fast: about 200px/step (1 line) or ludicrous speed which is skipping about 200-300 lines (40,000-60,000px) from a half-rotation of the mouse wheel (finger at the top of the wheel to the bottom, no free-scrolling) with no in-between speeds.
It's not the mouse, or the system, because other applications behave as expected.
The system does have the mouse scrolling speed set to the maximum, but it does not behave like that anywhere else.
If I set it to the minimum scrolling speed it scrolls about 10 lines rather than 200-300 at the maximum speed, but performance is still very poor and I don't really feel in control of where it's actually going to stop because MC's UI lags far behind the input.
And while reducing the scroll speed like this helps in MC, it's now too slow to use anywhere else.