21 Dec 2011 3:46 PM #1
Unanswered: Complex Dashboard Example, what is the bottleneck?
I'm trying to figure out why the example, "Complex Dashboard" @ http://dev.sencha.com/deploy/ext-4.0...Dashboard.html is so slow in IE9. In chrome its fine, but IE9, is constantly bogged down, and there is a noticeable delay before the table or graph recognizes that I've moused over them.
Is this just an implementation issue, like bad coding or a faulty design causing so much lag for IE9? Could it have been written differently to perform better?
I also tried the same example in the 4.1 preview and I didn't see any performance gains.
I also have a quick screen capture of IE9 having trouble with this example, http://screencast.com/t/TbfDmbyNW
21 Dec 2011 4:06 PM #2
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Performance in IE* isn't the best. 4.1.0 beta 1 is about to drop so check the performance with that as the layout system and other stuff has been totally rewritten in many places.Mitchell Simoens @LikelyMitch
Sencha Inc, Senior Software Engineer
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21 Dec 2011 5:35 PM #3
Open the developer console in IE9 (F12) and switch to the network tab. See if anything is hanging, and troubleshoot from there.
22 Dec 2011 8:10 AM #4
I played with the 4.1 preview a bit more, and did the following to squeeze out some more performance, but I guess i'll still have to wait for the "true beta" for a more accurate reading.
- Disabled animations
- For all charts
- Reduced item counts
- For my future purposes the number of items should never go above 6
- Disabled highlighting code
- IE9's "Profiler" was showing this as a big chunk of time
- Went from 72.93 ms to 28.97 ms inclusive time when switching between grid items
I also did another test by removing all of the charts, and then the grid was running fast, so I would assume that "charts" are the rendering bottleneck. But I can't remove them, since that's the entire purpose of the example.
- Disabled animations