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Re: Simple Join Issue

@evan_wells518 "not fully defined" means that some part of the sketch isn't locked down somehow. Those parts show up as blue. If it's blue, you should still be able to drag it and move it, which gives you a clue about how you might need to constrain it to lock it down. Maybe you need to add a coincident mate, or a dimension, for example.

The risk of it not being locked down ("defined") is that if you change a feature upstream, the sketch might not respond how you expect it to, causing issues. Usually they are noticed and just annoying to cleanup, but if it's for some high-stakes complex model, you might miss the error and go to production with a faulty design, which truly is nightmare fuel.

While it's not strictly necessary, it's a great habit to build. It's like cleaning up after yourself as you cook, so the dishes don't pile up and topple onto the floor. It's actually just less work and less stress.

EvanReese

Re: Slow Performance In Assemblies With a lot of Parts

You seem to have way more mates than you need! You should only have one mate for each key.
I would probably create a layout sketch defining the positions of the keys and insert that in the assembly, maybe using variables so you can adjust the spacing if you need.