Assistant uses excessive CPU resources

Hi!

Today I noticed my laptop getting unusually hot and when I looked, I found Assistant from the new Qt 4.6.0 RC SDK uses about 130% CPU resources.
I attached samples from ActivityManager.

I can consistently reproduce this (even after restarts) as follows:

• Open qtdemo via Spotlight
• go to "Concurrent Programming"
• go to "Run Function" (these two could possibly be arbitrary)
• click on "Documentation" which launches Assistant
• browse in Assistant (i went to the QtConcurrent section)
• Quit qtdemo now
  -> The CPU usage of Assistant explodes

This issue should be fixed before release of 4.6.0, as it is not uncommon to reproduce and has impact on system performance.

If i can assist in the tracking of the issue further, please let me know.

Thanks!