Same thing happened to me while coding with Sencha touch, and I thought it should be something with the library performance (ExtJS). After measuring everything

Same thing happened to me while coding with Sencha touch, and I thought it should be something with the library performance (ExtJS). After measuring everything correctly, and watching at the demo applications (which run fine on the phone) I saw that besides javascript work the difference where the box-shadows... Man that was a huge performance hit, removing them made the application actually usable, not like before.