So it should be a quick issue which would improve usability of the finder.
Apparently the bottleneck is at the creation of each group: we have to fill up the
runtimestorage of the group and this includes an access to a dictionary. I am pretty sure
the dictionary is useless in most case (because it's to retrieve elements by type, and
groups usually contain one type of elements)
So, Jannik suggested to cache group creation when importing a model.
Or we can hope that the speed enhancements in pharo 1.1 make the thing better.
--
Simon