CPU load too high

[GoogleCodeExporter]

From Users:

QtWeb.exe (portable version, location C:\Programme\QtWebBrowser) runs 
permanently 40-50% load on the
Intel Core 2 Duo CPU T5750 @ 2.00GHz even while not browsing the internet. 

....

Very strange, but I also noticed this trend on an Athlon XP 2000+.  CPU 
usage hovers around 70% when one window with 7-8 tabs open.  Not 
necessarily when the Google search engine is running…just all the time.

This strangely stops, however, when I open a new window.  For instance, 
this reply is in a new window with just one tab - there is another window 
with 8 tabs open:  CPU usage is 15%.  When I post this message, close this 
window and go back to the other window, I am sure that CPU usage will go 
back up to 90%.

[edit1] Sure enough, when I clicked on Post, the CPU usage went to 80%.
[edit2] When I close the additional window and go back to my main window 
(with the 8 tabs open), CPU usage goes to 80%.  But as I am typing this 
message in the main window (with 8 tabs open), the CPU usage drops to 
15%.  When I Post, it will go back up to 80% and stay there.

Very very strange.

----------------------

To investigate ...

Original issue reported on code.google.com by alexei.c...@gmail.com on 28 Mar 2009 at 4:06

[GoogleCodeExporter]

Problem was in Qt timers implementation ( javascript::SetTimeout() ), so 
appeared on 
JavaScripted pages which used timers, like google and youtube.

Problem found in Qt+WebKit implementation of SharedTimer (SharedTimerQt.cpp), 
ie Qt 
timers most likely use just a waiting loops that consumes CPU.

Portable Qt implementation of Timers replaced with native Windows timers, which 
not 
consume CPU time thus providing huge performance gain...

Qt 4.5.0 - SharedTimerQt.cpp manually fixed.

Fixed in QtWeb 2.0 build 041

Original comment by alexei.c...@gmail.com on 2 Apr 2009 at 6:01

• Changed state: Fixed