yesodweb/yesod — comment on commit b6be4efafe9386343ec913d88e74e87b24920b57
File:  line 0
By gregwebs:

So it will default to -O1 ? It would be better if we explicitly put the setting in there.

Most of the time programs should benefit from -O2. I assume that whenever you ran benchmarks you used -O2
For production compilation, compilation time shouldn't be a concern.
But perhaps we should do some benchmarks of O1 vs O2
I don't want to bikeshed on this though - we can change it to O1