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New option is you can choose your generator type. Default (new) generator supports block ID's up to 4096 (used in modpacks), but needs two times more system memory. Low memory generator (-lowmemory option in command line) reduces memory using by half, but supports only 255 types of blocks. However block ID's can be also bigger than 255, only number of various blocks is limited (first 255 colors from color's file are applied).