Messages slow to fully appear sometimes

I noticed that saving a repository has a slower save message appearing than other pages (see vid). Notibly it seems to pause about 1/2 through it's travel to appear and then hang for a brief period of time. This does not occur on other pages, so I feel something weird with repository. I tried creating a raw hosted and the same issue occurs so is not just Central (shown in vid). It was a little better tho, so either proxies may be slower or Central may be slower.

I was waffling whether to file or not but am concerned something else might be going on that might cause this behavior (though nothing obvious on screen). I asked Daniel Sauble who recommended I go ahead as we need to resolve performance related problems.

This does occur in m4 in OSS, so is not caused by the link, as far as I can tell (was initially testing in Edgy PRO bundle). I did not check NX2 at this time.
This occurs with debug on and off. Nothing notable in Console or log at default levels.