This is a rather simple idea, however I think it might help many people with weaker computers like myself.
The idea is this:
Create a command that enables you to bypass having to visit the spawn of a phase, which works the same way as .ph ownjoin, however you do not have to be the owner of the phase to use it.
This means that if I, for example, log out of a phase in Dalaran and then come back, with the usual .ph join command, I will have to go through a lenghty loading screen when going to their spawn and then through another to be teleported into the playable area itself. With this, I can simply .ph joinhere XXX and immediately find myself in the desired phase without the need of going through 7+ minutes of loading screens as usual.
This might cause a problem since the spawn areas usually contain the phase's rules etc., though it might work the way that you have to visit the spawn at least once to be able to use this command.