Ref T310557: Shellbox resource management, and namely pages which use the score extension (e.g. :test:User:TheresNoTime/sandbox), we should check that our re-render delay for real-time preview is >~2 seconds as to not trigger a lot of expensive API requests
nb, my own testing seems to indicate that we're well over two seconds of potential debounce time per request, but logging this just in case!