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I am creating new web applications and creating a new app pool each time. Is there a downside to doing this?

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Application Pools are fairly expensive. I will often advocate/build farms with the minimum number of accounts possible (for those covering App Pools, that would be a Farm Admin, Service App, and Web App account).

With .NET, there is minimal memory sharing between processes, and the SharePoint binaries consume quite a bit of memory without any end user activity.

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  • OK - I'm creating the app pools on the Development server though. So will this still be an issue? – jahlive Jan 27 '16 at 16:14
  • That would be your decision to make. There's nothing stating that it is wrong/will cause an issue, but just know that there is an increased memory usage. If you have 32GB RAM dev server and you create 5 Web App Pools but you're the only user, no you're not going to run into memory issues (most likely). – Trevor Seward Jan 27 '16 at 16:17
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The downside is: you can hit the recommended limit of 10 app pools: see https://technet.microsoft.com/en-us/library/cc262787.aspx#WebserverAppServer.
Also note the limit of Web applications (20).

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  • Is there any reasons to why there is a recommended limit? Please elaborate your answer. – Christoffer Jan 27 '16 at 15:03
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    Unfortunately, the article I mentioned is the best resource we can have on this subject. As they suggest, it's all a matter of performances (remember accounts, check health, monitor services...). Plus, to be honest, a matter of maintenance. Also, dont forget that you also have the 20 Web apps limit... – Evariste Jan 27 '16 at 15:12

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