656adc53b4
While I originally made these so that they wouldn't be on by default due to concerns over the filtering used for these leading to reduced framerates/interactive speed, I'd since found while doing some profiling that this isn't the case. Rather, decreased framerates were more likely to stem from trying to perform the checks necessary for the long-keyframe drawing when many "child" channels are involved (affecting other channels too). So, since these are generally useful, they are now enabled by default :)