Found the similar bug description in Ubuntu, but it has been marked as fixed:
Steps to reproduce:
1. Start Quanta
2. Open a large quanta PHP project (about megabyte of source code, 300+ files)
3. CPU goes 100% and quanta hungs about 3-5 minutes
Then all things seems okay.
I dont think its a slow cpu problem, I have CPU "Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz" and memory 4Gbyte on my desktop.
Kdewebdev versions installed:
PS. Zend Studio works perfectly with this large project.
Don't know where to forward this issue, please help.