[purephase]

Any concern with running Ruby 2 in development and 1.9 (presumably) in production? I'm doing it now for the startup time boost in both console and thin but worried I'll inevitably introduce some code that will not play nice.

[vampirechicken]

If you want startup time boost, check out the zeus gem.

Try to keep your environments as consistent as possible, whenever it is reasonable to do so. In the long run, it's better for your peace of mind.