enabled=false only suppresses output, still has overhead

[Socob]

Using @showprogress enabled=false suppresses output from being printed, but any overhead from updating the Progress object is still there (see e. g. progress_map()). I think enabled=false should make @showprogress a no-op instead, since anything beyond that is just wasted time!

[MarcMush]

performance has drastically improved with #325, you can open the issue again with a MWE if the overhead still is too high for your usecase