Epic #65429: Speed up for Fluid ViewHelpers by usage of CompilableInterface
f:switch very slow since it does not implement CompilableInterface interface
<f:switch>) does not implement
CompilableInterface. This prevents the
TemplateParser from caching it, making template rendering unbearably slow.
<f:if> on the other hand does implement the interface (through
AbstractConditionViewHelper) and gets cached properly.
<f:switch> should be cached!