Chrome Version: 57.0.2950.0 (Official Build) canary (64-bit)
OS: macOS 10.11.6 (Retina MacBook Pro)

What steps will reproduce the problem?
(1) Navigate to Gmail
(2) Hover over anyone's name in a CC: list on an email

What is the expected result?

Expect the pop-up to be displayed promptly.


What happens instead?

The shadow of the blank pop-up is displayed for a second until it's filled in. The user experience is pretty bad.

This is definitely caused by timer throttling for hidden iframes from  Issue 616519  and  Issue 647393 . A certain number of callbacks should be allowed at full speed before the throttling is introduced.