I was recently working on an issue involving the MMC hanging and pegging the CPU when trying to import a large report that was exported from another site. I found the root cause and a KB will be released soon documenting the details for the issue. There wasn't a good workaround available (basically create a new report and copy/paste the SQL query into the new report instead of using the import/export report functionality) so I looked into ways to transfer a report programmatically.