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My _colors partial seemed to be the one causing compile errors, I first commented out the big mixin inside of _buttons to see if it was causing the issues, without success. I then removed all @imports of _buttons & _colors, which only reduced compile time to 10 seconds
After disabling inclusion of my _colors partial & _buttons partials.

My app, subsequent run, webrick:
Started GET "/assets/application.css" for 127.0.0.1 at 2011-09-01 09:33:56 -0400
Compiled pages.css  (232ms)  (pid 71666)
Compiled style.css  (8404ms)  (pid 71666)
Compiled users.css  (1889ms)  (pid 71666)
Compiled application.css  (18ms)  (pid 71666)
Served asset /application.css - 200 OK (10591ms)

There were no compile errors here, but the compile time still seems very long.

Initial run after bootup, webrick:
Started GET "/assets/application.css" for 127.0.0.1 at 2011-09-01 09:35:14 -0400
Served asset /application.css - 200 OK (47ms)

Second run, webrick:
Started GET "/assets/application.css" for 127.0.0.1 at 2011-09-01 09:35:51 -0400
Compiled pages.css  (319ms)  (pid 83006)
Compiled application.css  (19ms)  (pid 83006)
Served asset /application.css - 200 OK (434ms)