I found this and thought I’d pass it on.
When implementing a PPS dashboard, the browser of choice should be Internet Explorer 8.
Whereas IE7 only supports up to 2 concurrent connections to the server, IE8 supports up to 6 concurrent connections to the server. In cases where there are a lot of objects on the dashboard you should see a significant increase in performance. This is because each object on the dashboard (each filter, each scorecard, each chart) requires a connection to the server. Instead of rendering only 1 or 2 objects at a time, IE8 can render up to 6 at a time.