What is the performance hit of enabling sessions on Google App Engine?

Posted by Spines on Stack Overflow See other posts from Stack Overflow or by Spines
Published on 2010-03-14T00:17:12Z Indexed on 2010/03/14 0:25 UTC
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google-app-engine

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java

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session

What is the performance hit of enabling sessions on the Google App Engine?

I just turned on <sessions-enabled>true</sessions-enabled> in my Google App Engine app and now my requests are consistently using 100 more ms of CPU time than before I enabled it. It also makes the user wait an additional 100ms for the server to respond on each request. This seems to be quite a significant cost, I'm not even calling getSession or using it in any way yet and it still adds this extra latency.

Is there something I can do to speed this up?

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