Hi, I have done a new version of this morph. Since the basic list morph can now render all kind morphs, I wanted to try with a new approach consisting of wrap each element with a designated morph. For the default behavior, speed is a bit better MessageTally spyOn: [ SystemNavigation default browseAllCallsOn: #+] old version: - 3829 tallies, 3843 msec. new version: - 2824 tallies, 2824 msec. I use the same approach for a new sender implementation using spec and since I already know the column widths, the speed is really better - 835 tallies, 840 msec. (and it does a hierarchy sort) I am currently working on this aspect (if the model specify the widths, is it really faster ?) Code is available here: Gofer new repository: 'http://ss3.gemstone.com/ss/DirtyExperiments'; package: 'MultiColumnList'; load This code is depending of issues 5283 and 5181 Ben