Cancel button work very slow

By var... on April 23, 2012 14:56 (imported from Google Code)

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What steps will reproduce the problem?

1. Have a good repository with 200'000+ files.
2. Change some files
3. Click Commit to see dialog with changed files
4. It sleeps for a long time
5. You would like to cancel and press Cancel button
6. It is cancelling after 10 minutes.

What is the expected output? What do you see instead?
Cancel almost immediately.

What version of the product are you using? On what operating system?
1.7.8

Please provide any additional information below.