FindPagesWithCriteria and FindAllPagesWithCriteria are methods in EPiServer CMS's API for locating pages based on criteria other than location in the page/content tree.
Due to it's lack of developer usability and relatively slow performance it's a method many developers love to hate. My recommendation: use EPiServer Find instead :)
It has been proven by numerous sites that EPiServer CMS can handle huge amounts of content. Doing so does bring a few challenges though. Here's a few few patterns that I've identified when it comes to building large scale EPiServer sites with great performance.
"To cut to the chase directly there’s nothing Page Type Builder can do to fix this, but ... it ships with an extension method for PageDataCollection named AsTyped that gives users of FindPagesWithCriteria and the GetPages method an easy workaround."
Understanding EPiServer CMS' API is key to any non-trivial EPiServer project. When it comes to performance understanding how different methods are cached, or not cached, is essential.
When using Page Type Builder we can easily filter collections of pages based on type by using LINQ.
