Faster, Easier, More Stable
New features are great, but when we asked our community what we should do to make Ext JS better, three
topics came up again and again – speed, reliability and ease of use. Ext JS 4 delivers on all of those
fronts.
Speed
Everyone cares about performance – whether it’s how fast our applications load, how long they take to
render and layout, or how fast they feel when interacted with. One of the most time-consuming parts of
application execution is layout. Ext JS 4 features a brand new layout engine, using all of the
experience we have gained crafting this framework over the last 4 years.
Those who were able to join us at the conference saw just how fast the new layout engine is, and that
it uses the exact same API as Ext JS 3. Although the layout engine is by no means the only performance
improvement we have made, it has such a stunning impact that it deserves its own special treatment in a
blog post nearer the release date. Ext JS 4 is far faster than anything we’ve ever created.
Stability
For Ext JS 4 we have overhauled our quality assurance efforts to deliver the most stable framework we
have ever conceived. To start with, the framework has the best test coverage it has ever enjoyed, with
thousands of new unit tests ensuring that the code works properly.
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