Selenium performance with InternetExplorerDriver and IE11

I am facing a very slow response when running my scripts on IE11. Sometimes, I get FocusWindowsClosed, ElementIsNotClickable. I have changed the zoom settings for all zones, created feature BFCACHE for IE in feature control, added capabilities into my code but nothing works for me. If anyone has any idea why I am facing this issue. Do i need to downgrade window or IE versions? I have also downloaded the same version of selenium client server with same IEDriver which is (3.8.0).