When dealing with a site migration that has hundreds of thousands of nodes with larger than usual field values, you might notice some performance issues.
In one instance recently I had to write a migration for nodes that had multiple fields of huge JSON strings and parse them. The migration itself was solid, but I kept running into memory usage warnings that would stop the migration its tracks.
Sometime during the migration, I would see these messages:
Source: New feed
Memory Management with Migrations in Cheap WordPress maintenance support plans 8
