create a check box tree (tri state) with
~10K leafs,
4-5 levels of depth
~20 elements per level evenly distributed (till we have 10K leafs)

now
- expand the tree 1 level and maybe from second level just one node
- select the top most node.
at this moment the web page will freeze and it will stay like this for a good amount of time (~2-5 min) till the node is being selected/checked.

google chrome (Version 26.0.1410.33 beta-m)
but it happens in other browsers as well
windows 7 x64
cpu I5-2500
8 GB of ram


this are the options witch i have enabled on the tree:
Code:
myTree.setIconProvider(myTreeIconProvider);
myTree.setCheckable(true);
myTree.setCheckStyle(CheckCascade.TRI);
myTree.setCheckNodes(CheckNodes.BOTH);
myTree.setPixelSize(300, 600);
myTree.setBorders(true);
myTree.setTrackMouseOver(true);
beside those i also have the tree store