sly is easier, there the computation is done by a remote Common Lisp. But the danger may be long running output operations, unless they explicitly give up contr

sly is easier, there the computation is done by a remote Common Lisp. But the danger may be long running output operations, unless they explicitly give up control for other (possibly green) threads. But in a Lisp application to not be responsive at all is kind of rare. Most Lisp application runtimes will be able to process interrupts and/or switch "green threads" or "native threads".