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1. The fist workaround will not need any additional action from your side. Simply use the start scrips in order to start RapidMiner (e.g. by using "RapidMiner (Console)" from the start menu instead of the usual "RapidMiner" start menu item or desktop icon). If the amount of used memory still is not sufficient, you can simply edit the line with "MAX_JAVA_MEMORY" in the start script (located in the scripts subdirectory) in order to allow for more memory.
I guess this has the same net effect as your second fix.
Just as a final note, innocent bystanders should not get the wrong conclusion from this thread. It is precisely because RM empowers me that I complain, if it did not have the grunt to tackle large problems I would have nothing worth putting on other servers. On the back of that ability I'm just about to upgrade to dual quads with obscene amounts of gigglebites; so no difference between pooting and real life then, kick those closest to you, as you can't reach the rest!