Hi Jonathan,
I know this is an older thread, but I wanted to reach out and let you know that we're ending support for IE11 next month. If you're still using IE11, you'll see the following message:
Adobe will be ending support for Internet Explorer 11 within Adobe Analytics on November 13, 2018 in accordance with Microsoft's own end of support for this version. Please switch to Microsoft Edge or another supported browser as soon as possible.
Please let us know if you see performance issues in Edge, and we can look into that further. Thanks!