Bound TreeModels really slow

[Diego Zuccato <diego otello alma unibo it>]

Hello.

Just done some testing loading 20030 rows from a DB to treemodels:
* Just reading from DB: <1sec
* Unbound treemodel: 2"
* Bound treemodel: 166" (GLIP!)
* Unbound TreeModelSort: 14" (not too bad, could be improved for batch 
updates?)
* Bound TreeModelSort: >40' (still running)

What could I do to speed it up (if possible whithout unbindind/rebinding 
the model to all its views)?

BYtE,
 Diego.