>Very strange. I don't see why a constant should slow down creating the view definition. Maybe it's the number of fields? Do you see the same performance if you remove one or two of the other fields?

Yes, when I remove some of the other fields, there is also a difference. However, when I remove at least three of the other fields, the performance is the same as when I remove the constant.

I did not test this very extensive, but I always got the same results.