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What version is this?
Try using a graphical rule and use multiple script components as the recommended lines are about 500. Or have the script in a .csc file and do an import.
We are on version 126.96.36.199.600
I did an export into an .xml document, made my edits in Notepad++, and then imported them back in. That took all of 30 seconds to complete. MUCH faster.