DLP 12.5 and IE browsers

We have many issues with 11.6.3 and IE 8. We plan on upgrading DLP to 12.5 as well as move away from IE8. My question is, has anyone had problems with IE 8 where the user experience crawls with some sites when monitoring HTTPS, and have those issues gone away when upgrading to 12. and IE 10 or 11?