Hi Linas, Linas Vepstas writes: > To make this conversation less crazy, and more down-to-earth, here is a > demo that seems to spend most of its time in GC. Hard for me to to say that > this is "wrong", right now, but it illustrates the scandalous nature of the > problem. Do you have many string operations in your code? If I replace (cons (format #f "~A" cnt) lis) with (cons cnt lis) GC is down to ~20% (from around 130%). Best wishes, Arne -- Unpolitisch sein heißt politisch sein ohne es zu merken