There is a definite memory increase when using GridPanel with a store. Every time the store is reloaded and grid is rendered, the browser consumes more memory and it does not seem to free it. Best example is IE, which can consume over 1GB and crash within 30 minutes using the attached code.
Working code is attached. Unzip it into ext/examples
Steps to reproduce the problem:
Open Click on Autorefresh button
Observe memory consumption using e.g. sieve or Sysinternals Process Explorer