I hate to say that I am seeing no issues.. but I am seeing no issues.
There are only 3 things loading externally for logged in members...
I just turned two of them off.
1) Google Analytics - This is a stats keeper for the site
2) Quantcast - This is another stats keeper
Having both of them gives us good solid stats on how everything is doing.
The third is the Google Ads. The only external ads being displayed by registered members are now Google ads. I stopped showing ads from ADSDAQ, ADIFY and Burst Media to registered members because those ad companies did at time have speed issues. Google Adsense on the other hand is really stable as far as speeds go.
So are you seeing any difference with analytics and quantcast turned off?