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Environment/Versions TTworkbench 32/64 Bit, Microsoft Windows/Linux Answer Some large projects may require much memory for compilation. To avoid  any memory issue*,  you need to increase the memory reservation. Depending on your Operation System and RAM (8 GB recommended) you can increase the following values in the ttworkbench.ini file (located in the TTworkbench installation directory) e.g. : 32bit OS: -Xmx1024m 64bit OS: -Xmx2048m                        (or more if available and needed) Notes: If your values are too high, your system will swap memory to your hard drive, which may slow down the system. (*) 'out of memory error', 'heap out of memory' or 'PermGen memory error'.