I suppose only in dev and testing environments.
The debugger "listens" to your program (e.g. whether you started a new thread) once it's required, so it'll more or less cause some extra computation even if you don't enter any debug session. The performance impact may not be noticeable in dev, but you probably don't want to try it in production.
However, if you only require it manually outside the web server process (e.g. a Rails console), that may be fine (I haven't tried it so can't be 100% sure).
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I suppose only in dev and testing environments.
The debugger "listens" to your program (e.g. whether you started a new thread) once it's required, so it'll more or less cause some extra computation even if you don't enter any debug session. The performance impact may not be noticeable in dev, but you probably don't want to try it in production.
However, if you only require it manually outside the web server process (e.g. a Rails console), that may be fine (I haven't tried it so can't be 100% sure).