I have filed a feature request for this issue, if you feel so please
star it.

http://code.google.com/p/googleappengine/issues/detail?id=720

Here is the description:

Well, I don't get the purpose for having a High Amount CPU Quota since
there is already a general CPU Quota. And there are quite a lot of
problems caused by this quota which restrict my application from
affording more load. And my application is far away from a 5 million
month PV app.
1. Requests can become a high amount CPU one very easily. A little
complex request will consume more than 3K mcycles. And what do I mean
a little
complex? If you do more than 2 put, or you do a url fetch, or you do a
query based on an order to select more than 50 model, or you do a put
on a
model more than 20 fields, it is that complex. In my case, 80% of the
requests are that complex and I don't think it can be optimized
anymore
since I do need to do put and url fetch.
2. Bad visibility to this quota. There is no way we can know when we
will run out of quota for this. All we got is the warning in admin
console that
says our requests are using high amount CPU quota and will soon run
out of it.
3. Doesn't back to normal quickly. I'm using a script to continue
fetching my data from production and do some offline process.
Unfortunately I fetch
too much in one call that I try to get 100 models at a time and which
makes the request a high CPU one. Soon, I meet quota deny. Then I stop
my script,
but after 1.5 hours, I still see quota deny for requests from my
users. The "Many of the requests to your application are taking a very
long time.
Please optimize these requests." warning keeps there even I have
stopped the script for so long time.

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