I'm writing a simple web app with which people can migrate their email from one server to another. I've read about imapsync and tried it out. So far it works very good and seems to be a good solution. At the end of the migration it tells me it had used ~ 350 MB of memory.
Another possible solution is the imap-move PHP script. It has its own GitHub page here: https://github.com/edoceo/imap-move. I can't seem to find out how much memory it uses.
I want ~ 30 users to be able to use the web app at the same time, without running out of memory. I want to test which solution is the fastest and/or uses the least memory, but don't know how. Any suggestions?