We've been seeing pretty brutal response times intermittently for our
app (id: skrit), which I can't figure out. Some more info:

* They're clustered in time: all requests will be slow for several
seconds at a time, dozens of times over a couple hours
* The long periods of slowness often happen in the morning, although
not always, and not every morning
* Traffic doesn't appear to be related, and is low (less than 5
requests per second)
* It's not instance startup costs. I'm logging when things are
imported, and on a small request with no datastore interaction:
-- with no startup costs, normally around 30-200ms, spikes to
1300-1600ms
-- with startup costs, normally around 1300-1600ms, spikes to
4000-11500ms
* It doesn't seem to be related to dynamic get latency or anything
else on the serving status page. Initially, we thought it was loosely
correlated, but I think those were just flukes. This happens much more
often, and for much longer, than serving latency is ever high.
* It happens on all requests; I've just given numbers for simplest/
most common request.

As far as I can tell, this has only been happening for the past month
and a half or so.

Any ideas? It's as if we're just intermittently being given really
slow serving.
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