Extreme performance issues
I think ext is a great tool for all developers. Some components could be better in performance like the grid but ok.
Since a few weeks i noticed that our ext application is slow. I always though that it is ext which makes it run so poorly but then i checked it twice. It only is my application which runs so bad.
When i change the tab (firefox) from for example the ext example page to my application the system cpu load goes from 0-1% to constant 45% (centrino dual duo core 2.5). It always has round about 40% no matter if you do something or not. When you change a tab or something sililiar the load grows and returns to 40%.
I tried to find the bottleneck with firebug profiler but there was no "task" running and no javasript manipulation running so i dont understand what takes the cpu time. I can not provide the full application here.
The whole application is round about 70 screens with a lot of forms and grids. They are all included on startup but are not rendered on startup. We have a menu which "shows" the panels when needed.
The main panel is a viewport with a border layout. The center region is a tabpanel with the deferredRender:false option. This is needed because we have to load data into forms and this would not be possible without this option, right?
Today i tried ext 2.2 but the situation didnt changed. I would be glad to have a short hint from every experienced developer in this forum. At the moment i dont know how to start to identify the problem.
Thanks in advance.
Robert
My setup: Firefox 2.0.0.16 Windows XP SP2 Ext 2.2
Robert
I have already tried to disable the firebug console but this makes no difference.
Its the same behavior on computers with a pure firefox installation.
Do you have another idea?
Robert
When I load the site and quickly change to another tab in firefox the site loads and the cpu load goes to 0%. Then i go back to my application and can click around and us ethe app and it never hits the 40% boundary.
That means this performance problem only exists when the app is loaded in a visible firefox tab.
Can anybody give me a hint?
Robert
We'd be glad to help you out and try to get your performance issues resolved. As you may have figured out by checking out our samples this is not typical and there may be some misconfiguration on your end.
Could you provide us with some sample code which maybe illustrates the issue? Have you tried on other machines? By "pure" firefox I assume that you mean without any plugins? A lot of times plugins can misbehave and cause performance issues as well.
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