java -server -Xms1024m -Xmx1024m -XX:+AggressiveHeap -jar MZmine.jar NumberOfNodes=4
This will start mzmine with the java server version (J2EE), which gives almost 20-30% speed improvement. You must check if you have in your java bin directory the subdirectories client and server. If you have a dual core or dual processor machine you can use 2 nodes. If your hard disk array (like an Areca-1120 RAID5) provides enough bandwidth, you can set the number of nodes to 4, even if you do not have so many cores, however speed will improve a little bit due to faster threading (using more nodes than real processing threads are available usually reduces speed with large files, with small files it works). You should have at least 2 GB RAM or otherwise you have to adjust to -Xms512m -Xmx512m.
A complete alignment procedure (mark all files and use mzmine "define batch mode" and set all options to the first possible option; the result window should have 3 alignment files) with the faahKO sample data runs in 15 seconds and the Croseus example in 3 minutes, using a Dual Opteron 254 (2.8 GHz) with an ARECA-1120 RAID5. This is fun!