Slow Pop Up Windows Since Upgrade to D365

​​Has anyone else experienced extreme slow to response instances since upgrading to D365 ?  When my organization tries to do anything that requires the additional window we have to save and close and then reopen it in order for it to respond, this only started happening after our upgrade to D365. For example; when we add a quote and it opens an additional screen we have to save and close it or it takes forever to type anything in the fields, once we save and close it and then reopen everything works fine.

Any feedback would be appreciated.  Thank you.