One downside of doing Quicklisp dist testing in Docker is the disk performance is way, way, way slower. Any pointers to troubleshooting you can recommend?

@quicklisp A Linux host is much better than OS X or windows + virtualisation, if you're not already doing that. Mounting a volume to a temp directory outside the container should help, if you can direct most of the IO there.

@quicklisp docker info | grep Storage. overlay2 is an ok choice. devicemapper (default one with a loop device) is bad. Also, use docker run -v to mount host dirs or docker volumes w/o any layering

@quicklisp A fine file system and the :delegated keyword on volumes can help in some situations