wp-varnish perf issue on marking pending comments as spam

[Chris Hecker]

Not sure if this is an appropriate place for this...

I was having huge performance issues marking batches of pending comments 
as spam, tons of httpds spawned, giant mysql spikes, etc.  I narrowed it 
down to the wp-varnish plugin, which is apparently purging the cache on 
every spam comment, even though they were pending and not displayed on 
the page.  Disabling the plugin and then marking a batch as spam would 
be tens of times faster (<1 second for 75 comments versus 20+ seconds).

I'm not going to have time to take a look at this for a while, and I'm 
just going to do the disable dance in the meantime, but if somebody else 
gets to it that'd be awesome.  I assume it can just check if the comment 
was pending and then not purge and the problem would go away.

Chris