Or you can inject grid with fetch xml which will not retrive data at all on every load.....but don't think this will be a good idea.
If you want to have a look at this option following are some references.
http://srmscrm.wordpress.com/2012/11/05/changing-the-subgrid-fetchxml-in-ms-crm-2011/
http://crm2011suriya.wordpress.com/2012/07/16/crm-2011-dynamically-change-sub-grid-fetchxml-left-navigation-pane/
Thanks Regards Prashanth Kamasamudram Even the least work done for others awakens the power within; even thinking the least good of others gradually instills into the heart the strength of a lion.