Code:
##
## Layout Browser Demo -- Maximize/Restore Window Size
## First, find the tab containing the grid and click on it
## Tests were done with Firefox 3.6 on a 2.66 GHz laptop.
## Profiling was enabled below.  Therefore, it's much
## faster when not profiling. Below 2 seconds for C3.
## IE 6 handles this scenario very well -- under a second.
##
 
Release  # of calls  Time (secs)
=======  ==========  ===========
 C3         6,920       3.100
 3.1.1      8,537       3.172  (upcoming 3.1.1 passes 2.3.0 here)
 2.3.0     10,550       3.227
 3.0.3     38,784       4.881
 3.1.0     25,658       5.300
Look, the upcoming 3.1.1 release passes 2.3.0.

Jamie is working on something for the 3.1.2 release
which may pass the C3 build I have.

Something is finally better than Ext JS 2.3.0.