I've recently upgraded to IGB v8.3.0 on OSX, but I don't seem to have the option for choosing different RAM version as there used to be.

Anyone know how to change the RAM requirement? Currently only able to access 1GB.
Nowlan has already done a great job explaining the new default behavior, but I will add a note for power users. There is a "vmoptions" file in your IGB installation directory which contains a commented out jvm argument for setting the max heap size. If you want to manually control the heap size you simply need to uncomment this line and adjust it to your needs.

 - On Mac
   - `/Applications/Integrated\ Genome\ Browser/IntegratedGenomeBrowser.app/Contents/vmoptions.txt`
 - On Linux/Windows
   - `${IGB_INSTALLATION_DIR}/IntegratedGenomeBrowser.vmoptions`