Fixing slow initial load for IIS

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Options A, B and D seem to be in the same category since they only influence the initial start time, they do warmup of the website like compilation and loading of libraries in memory.

Using C, setting the idle timeout, should be enough so that subsequent requests to the server are served fast (restarting the app pool takes quite some time – in the order of seconds).

As far as I know, the timeout exists to save memory that other websites running in parallel on that machine might need. The price being that one time slow load time.

Besides the fact that the app pool gets shutdown in case of user inactivity, the app pool will also recycle by default every 1740 minutes (29 hours).

From technet:

Internet Information Services (IIS) application pools can be
periodically recycled to avoid unstable states that can lead to
application crashes, hangs, or memory leaks.

As long as app pool recycling is left on, it should be enough.
But if you really want top notch performance for most components, you should also use something like the Application Initialization Module you mentioned.

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