Things I've tried:
- Removing everything except for Laravel (version 4.2.*) - This completes but still hangs for around 5 minutes
- Updating composer
- Removing /vendor
- Doing clean Laravel 4.2 install (hangs around 3 minutes)
- Doing clean Laravel 5 install (doesn't hang at all)
- Turning off xdebug completely (doesn't seem to make a difference)
With all my packages, I've seen composer complete but only when I left it running overnight. I can't deploy to forge at all because it times out! This only started happening two or so weeks ago.