[garbeam]

As pointed out above, suckless isn't focussing on macOS/XQuartz users. The latency of "linux-st" isn't that bad according to the plots of the author.

In my view, simplicity often leads to better performance as a side effect -- but of course there are many exceptions.

Nevertheless, I wouldn't start optimising software unless the software is really unusable. Optimising software to look well in rare corner cases is not a good idea imho, if the price is adding a lot of complexity.