Running `gem pristine --all` ... will improve the startup performance of Spring. (doesn't actually do it)

Question

I am running the Thin server for my Rails app locally. Every time I start it I receive the following message:

Warning: Running `gem pristine --all` to regenerate your installed gemspecs (and deleting then reinstalling your bundle if you use bundle --path) will improve the startup performance of Spring.

Even after I run the command 'gem pristine -all' it takes a long time for the server to restart, and the message then appears again. Why so?

Answer 1

gem update --system to get rid of the message works for me.