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Asked: 2026-05-11T01:03:40+00:00

I am using Entity Framework with my website. To improve performance, I have started

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I am using Entity Framework with my website. To improve performance, I have started to use compiled queries wherever I can, either directly with CompiledQuery.Compile or using ESQL.

The performance now is fantastic, that’s it, once the queries are compiled. Compiling them takes quite a bit of time on some pages apparently, so the first hit is always really bad.

That should not be a problem as once it is compiled it should be good as long as the website is up and running. However, in reality, this is not the case. After a certain period of inactivity on a page, it feels as if the query is recompiled (when I access it again).

It is possible? Does IIS (v6) clears the cache of compiled queries? Can I prevent it from doing so? Can I actually confirm that this is the cause of the problem?

Thanks, AD

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  1. I think they are recompiled when your application pool is destroyed because of inactivity. You can tune application pools using MMC Console of IIS 6.0.

    Guide is here

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