To keep an environment from the being garbage collected, assign it to a global variable -- as long as the variable holds the environment, it will be safe. This won't speed up the GC. It's possible to make s7 strings that are not seen at all by the GC (make_permament_string), but it's much trickier for an environment -- you'd have to be sure that every cell of every variable in the environment was permanent; otherwise the cell might have no one else referring to it, and the GC would free it.
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