[kde-linux] monitoring konqueror degrading performance

[Pol]

Opening several konqueor windows (kde 3.5.10), each with dozens tabs,
steadily slows down performance. 12-24 hours working result: 
 - tens seconds to switch tabs and to pop up inactive windows;
 - several minutes to render web pages, while reaching the same web sites
by a non graphic browser (e.g. links) takes one second. 

Any hints?
How to closely monitor konqueror activity, to spot the problem?

Thank you

---Pol