I am running Calc (126.96.36.199) in a MacBookPro (2.8 GHz, i7, 16GB 1600 MHz DDR3) with OSX 10.9.4 as a 64 bit application. I know 32 bit applications are limited to 4GB of memory but I would like to increase this on my machine so I can run very large spreadsheets and get a performance boost. How can I do this? Thanks for your help. I love the application!