SBCL + Sly on macOS results in slow REPL output

[dnaeon]

This one seems related to the following issue, but the suggested solution to turn off the dedicated output stream does not work for me.

• https://github.com/joaotavora/sly/issues/426

I'm seeing the same behaviour with Sly and SLIME when using SBCL on macOS. The issue is not present when using CCL or ECL for example.

A discussion from the past day about this issue can be seen here as well.

• https://www.reddit.com/r/lisp/comments/n9dyz1/sbcl_slime_macos_slow_repl/

@stassats provided a patch for SLIME, which I've tested and fixes the issue for me

• https://gist.github.com/stassats/2ff288d821937309aecca2424a2214ac

Submitting this one, because the same issue is observed with Sly as well.

Thanks!