Hello!
compile() isn’t supposed to cache the GCompiled’s, it is assumed as a “pure function”. Only apply() does so.
Please note once you called compile(), you get its return value – a GCompiled object - and you should use that one going forward. It is not connected with a GComputation in any way so you can safely destroy the GComputation, too (if you don’t need any recompilation, though).
Can you just use a GCompiled object in your case? You can consider this is a “compiled function ready to use”.