I have a RB1100AH setup with a Comcast connection, with Comcast in bridging mode. With the Tik in place browsing is beyond slow, not even really useable. Yet, if I remove the Tik it is as expected. The Tik has a very basic config.... Any ideas or things to check? Thanks!

What version of RouterOS are you running? Was the unit configured with the QuickSet function?