How do I work on larger collections without running our of memory ?

The start batch files and sh files for RcTools have a setting for your Java maximum memory.  You can make this larger for your collections by adjusting the -Xmx setting.  The default is -Xmx512m for 512 megabytes of memory.  If your tool reports an out of memory error you can increase this setting to available memory in the machine less start up.  So a machine with 2 gigabytes of ram could easily  be set to -Xmx1024m for this setting.

You can find the batch files under your installation directory.  For Windows the default location is C:\Program Files\RcTools\bin\   and on   Mac OSx  installs the default is the  /Applications/RcTools/bin directory.