Also against that, this would not be worth the effort, as the performance gain would be minimalist when you design your game with a good organisation (and also, that would actually break the organisation, which is a 100% no go in C2, where organising is really mandatory).As goto feels more like a cheap way to skip entire part of the code that will bite your hand when you will have to redesign some parts.
To be fair, if you have performances issues due to that kind of problem (like the one you exposed, aka potential useless or redondant checks), rethink the design, in your case, you could either do:
Play sound "Sound"&Sound_Variable (one action, no conditions, opposed to your 100 comparisons with the associated action play sound)
Or have a list List="sound1,sound2,sound3" etc..
Play sound tokenat(List, ",", Sound_Variable-1)