Norton Internet Security 2013 20.2.0.19 Still So Slow !

Norton Internet Security has slowed down my Core i7 PC with 8GB RAM even with the latest updates. Although now the  startup icon comes instantly performance is still slow and the interface buggy. It takes at least 5 seconds before I can click any  object on the interface. Also SONAR still detects multiple instances of the same download as well as CCleaner still finds orphaned Norton registries.  Does Symantec know about the issues, i.e. is there a major update in the pipeline or shall I simply downgrade to NIS 2012, which, in my opinion was really really fast. And I have read in several forums that the interface thingy is a real issue to many users. So how long will it be before a major update will be pushed....any ideas? 

 

Norton Take Note :  Firefox Addon DownThemAll still triggers the SONAR problem !