big worldspace

[PelinalWhitestrakeCrusader]

I'm trying to load in CK a 5120x5120 worldspace imported with tesannwyn but CK freezes at 91% loading and if I click in CK window CK crashes.

Is there a way to manage to load in CK this esp containing that worldspace?

I have already tried to cut down skyrim.esm but it was enough to allow me to load 4608x4608 worldspaces but now with 5120x5120 the problem has come back.

Any ideas?

Is it a RAM problem? (I've got 4GB and I increased RAM with flash drive's ready boost, too)