We are using MiniProfiler and on an action I noticed that before OnActionExecuting was called the time taken was between 75 and 150ms, the action was this:
public ActionResult Index(Guid guid, string fileName)
{
}
When I changed it to the following it dropped to 4ms.
public ActionResult Index(string guid, string fileName)
{
}
Has anybody else had these performance problems in Mvc with Guid binding?