Delayed scripts and tasks

Has anyone else had a problem with scripts and tasks going really slow?

For example, “rake migrate” alone took me 3 minutes for two migrations,
and the total time reported for the two migrations was .172 seconds.

Similarily, “ruby script/destroy model” produced no output for a few
minutes and then destroyed all the appropriate files in a fraction of a
second.

I can’t figure out why this is happening on some machines and not on
others.