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+++ This bug was initially created as a clone of Bug #509519 +++ - Import the attached projects (there is a Viewpoint Specification Projet and a Modeling project with a single empty Ecore) - Make sure the "Perfo Tree" viewpoint is enabled and create a new Tree representation on the EPackage - Right click in the tree on "Create Many EClasses" -> the code which is launched is in perfo.tree.design.Services.createMany(EPackage) and basically create 20K new EClasses each having 10 attributes, this should end up being a tree with 20K*10=>200K tree items. -> the UI thread is blocked and CPU goes crazy for a fairly long time, I gave up after 5 minutes No doubt there is n^n algorithm working its magic here. First hint: after a bit of digging, commenting out: willBeExpandedOnSelection(RefreshPlan) to always return false makes the whole tree to be created in about 10 seconds