The webstart links now accept a parameter vmargs= that allows you to customize the amount of memory that maptool is started with.
There is now an extra link beside the MapTool release candidate that uses this argument and shows the proper format.
The link looks like this:
http://rptools.net/dist/webstart.php/ma ... 20-Xmx256m
Webstart with larger memory support
Moderators: dorpond, trevor, Azhrei, Craig
Webstart with larger memory support
~Giliath