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We are developing application in ExtJS4.
using extjs4, WCF Service, with editor grid, and perfomance is very very very slow. application is running under IE 8. Can someone provide tips on tuning the perfomance.
Extjs in general has performance issues with IE .. i guess you are using the 4.0.7 the latest release. You can wait for 4.1.0 which should be a lot faster especially on IE, see their performance preview here