standard controller on object with many fields causes slow page load time? use a custom controller t

I just learned that Standard Controllers essentially create a class with one property for each field on the object, and that if you have many many fields you could experience slower loading times because of this, for standard Visualforce Pages at least. This raised a couple questions, 

1) does this affect VF pages that redirect to a Skuid page? and, if so,
2) would you recommend creating a custom controller to do overrides (and is that even possible) that only pull in necessary fields (id)?

I have a custom object with more than 600 fields and the redirect time is almost the same (if not the same) than a 2 custom fields objects.

What I have learn is it really improves the load times in the skuid page models to use the fields you need only.