During the initial grid load, any column show/hide and grouping will trig store to load. Suppose two columns (default are hidden) set to show, and another two column (default are show) set to hidden, plus grouping, total store load will be 2+2+1 = 5. Without patch in the proxy, the total layouts will be > 10.
I have tried many possible suspend/resume layout in my application, unable to reduce the total layouts. If you can put a simple example here to match 3.x.x performance, it will be great for the 4.x.x performance.
See original problem and simple test code at
http://www.sencha.com/forum/showthre...004&viewfull=1