I'm experiencing extreme performance issues when loading pages with vertical grouping in IE on Windows 7. For example, http://demos.telerik.com/kendo-ui/scheduler/resources-grouping-vertical will take 15 seconds or longer to load. During load time, IE will lock up for about 15 seconds and bog don my computer until the page finally completes rendering. This only appears to happen on vertical grouping since none of the other demos for the scheduler cause issues. The odd thing is that this seems to happen to random windows 7 machines. I have been unable to reproduce this on Windows 10 or in Chrome and Firefox. This happens in all versions of IE.