The test to compare TC vs TCI is simple: run ztreewin, root only method, in a tab. Then exit ztreewin to dos, without exiting TC or TCI. You will notice that ztree runs much, much slower under TCv9.0 than under TCI, no matter how many times the test is sequentially run. Seems like a video issue. Testing under Vista Ultimate SP1, 1gb ram. Hopefully this can be fixed in the future.