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DevMode allows reloading of configuration and validation related files, but because they happen on each request, this setting will totally kill your performance.
When using logging, make sure to turn off logging (esp. Freemarker generates a LOT of logging), and check if a level is enabled before printing it, or you will get the cost of the String parsing/concatination anyways.

Use the JavaTemplates plugin

If you use the simple theme, and do not overwrite any of the FreeMarker templates, considering using the Javatemplates Plugin, which rpovides a drop in replacement for most tags, and is a lot faster than the regular tags.

Do not use interceptors you do not need.

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