Most likely the issue was resolved by the reboot, not by uninstalling Chrome. From my experience Mac OS tends to slow down after a few days. Animations and scrolling gets choppy and there's nothing I can do to fix it, short of rebooting.
The change only happened for me after removing Chrome as well as the launch agent for keystone.
Just for the sake of the argument, do you have installed Chrome?
Very sad.
(I have recently started using Apple tools for developping with Swift/Xcode on iPad. I am very unimpressed by the quality of the tools, and quite impressed by the range and depth of features....)