Our customers started reporting slow page load times issues with our site recently. We have yet to find a solid connection between any recent code changes on our site to performance issues. In fact, UI wise, things have remained the same for the pages in question.
What we've tracked it down to so far is that customers experiencing the slowness have Windows 8 with IE 11. If any of those customers try a Windows 10 machine with IE 11 on the same pages, load time increases dramatically. We're talking about the difference between 20 seconds on Win8/IE11 and 6 seconds on Win10/IE11.
From what we can tell, both machines are the same in terms of what network they are on, IE settings of concern match up (no proxy, always check for new content, do not delete cache on browser exit, smartscreen filter turned on).
Any ideas on what might be the difference or where else to look?