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So I just received a lovely Japanese green maple today I popped it out of it's cheap pot to check the roots and they are totally rootbound should I leave it until it goes dormant or should I clean It up? I attached a few photos so you can see.

Now I would not repot; The tree has just invested in leaves and new roots and is lower on reserves than the rest of the year.

I would probably only put it in a bit larger pot for now. In late spring, you can consider partially defoliating the tree and just as the first buds respond (normally only days later) do a repot. Or give it a bit larger pot now, and repot in fall.

It depends a little on your experience.

I would just leave it in the current poor without doing any root work. It looks to me as if it could use a little more branch development and ramification. Being in a "tight fitting pot" will help work internode length. I would focus on a combination of unhindered growth with selective pruning. Water well and fertilize. When the fall or spring come around you could repot the tree then and not lose any time. Protect from extreme cold in the winter if you repot in the fall. I would also just use plain Akadama as my substrate of choice.
Good luck with your maple.

NatedavB0175A1 wrote: It looks to me as if it could use a little more branch development and ramification. Being in a "tight fitting pot" will help work internode length.

Depends a lot on the phase of development. I would say that the forcus should be on either development of the trunk, or setting primary branched. This tree for sure is nowhere near refinement. You will not get the real growth needed for building branches in a restricted growth scenario.

leatherback wrote:

NatedavB0175A1 wrote: It looks to me as if it could use a little more branch development and ramification. Being in a "tight fitting pot" will help work internode length.

Depends a lot on the phase of development. I would say that the forcus should be on either development of the trunk, or setting primary branched. This tree for sure is nowhere near refinement. You will not get the real growth needed for building branches in a restricted growth scenario.

Yes, I agree definitely in the development phase. I still wouldn't do any root work at this time, just a slip pot into a larger container to allow for root expansion. Then perform a proper repot in fall given you can provide adequate winter protection or more ideally, next spring before the buds begin to leaf out.