varnish *slowing* down site, any ideas?

[Zachary Alex Stern]

Hey there,

We have a lot of websites (perhaps 15-20) running on apache, behind a
varnish cache.

One of our sites seems to experience random slowdowns when varnish is
enabled. It will take between 5-20 seconds to load, fairly frequently. Our
other sites all seem unaffected.

When I disable varnish and have apache listen on port 80, the problem
disappears entirely.

Any thoughts?

Here's our vcl.conf if it helps: http://pastebin.com/XPUvSPeu

Thanks!
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*-Zachary Alex Stern*
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