I wrote a few small scripts to test this out. Each contained a simple print statement, then looped it 5000 times and timed it. There is ~2.1% overhead when usi

I wrote a few small scripts to test this out. Each contained a simple print statement, then looped it 5000 times and timed it. There is ~2.1% overhead when using env. This doesn't matter in most cases, but in a Google-sized company with standardized environments it's worth it.