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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?
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