At some point during a recent upgrade, the template list likes to hang / freeze for a good few seconds. It's mostly when you use the Filter textbox. It just hangs before changing the results. I only have 1 master style installed, 1 sub-master style and 4 derivatives of that sub-master style. Happens on both Chrome and Safari, running OSX Yosemite, fully updated and patched. Although on Safari it doesn't seem to be as sluggish. Strange question I know, any thoughts?