I hadn't heard of this issue with SBCL before so I went searching for it. I guess you're referring to this: https://log.schemescape.com/posts/lisp/sbcl-file-per

I hadn't heard of this issue with SBCL before so I went searching for it. I guess you're referring to this: https://log.schemescape.com/posts/lisp/sbcl-file-perf-windows.html https://log.schemescape.com/posts/lisp/sbcl-file-perf-window... That article points out that the issue arises only on Windows. Do you have any evidence of such an issue on Linux or other OS?