I have not yet seen any even remotely official information source associating language/compiler/etc. restrictions with background processing, just a growing num

I have not yet seen any even remotely official information source associating language/compiler/etc. restrictions with background processing, just a growing number of comments like yours claiming that there is multi-tasking magic (for which there is no available evidence or technical reason) and that said magic would fail in the face of alternate languages, compilers, etc. Can you cite any references for your claims?