[alexchantastic]

I also see the cog and am noticing the lag. I just sent you an email detailing my observations as well as a video of the issue.

[ThomPete]

Great.

It seems to be an issue with SIMBL which is installed with a lot of addware and older safari plugins. We are looking into the issues and getting back to each person with a solution.

For what it's worth its not related to our code.