Have to instantiate a 9x9 of planes and its slow. What can I do to fix this?

I have a good desktop that can handle a lot, but it takes about 3 seconds to load 81 planes. How can I fix this?

Instantiating and destroying comes with relatively high cost. It is better to instantiate your Map in the Awake() function, and disabling all their renderers, so they are invisible.

When you need them, you can do a foreach to enable the renderers again.