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Extjs 3 to Extjs 4

I want to migrate from extjs 3 to extjs 4. I have tested sample Extjs 4 example in rails 3. I have observed that page rendering time is very slow in extjs 4. I don't know what is the reason.
Can anybody tell me, what is the reason behind that? or
is there any problem in my app? and
What should I do to improve the perfomance of extjs 4?

Solution

  • ExtJS 4.0 has performance issues,

    ExtJS 4.0.2 is the release you need that fixes most performance issues, it is still slow though...

    Google for ExtJS 4 performance