Sometimes, I prefer to invert the numbers to get the time saved to put things into perspective. 

27367269 calls/s = 37 ns/call
31367629 calls/s = 32 ns/call
35161744 calls/s = 28 ns/call

[download]

So _: is 9 ns faster than return (assuming the numbers are meaningful).

After 100 million calls, you still wouldn't have saved a second by switching from return to _:.

Update: I had moved a decimal point in the wrong direction. Fixed.

In reply to Re^3: Label makes a sub to return empty list -- "secret"? documented? by ikegami
in thread Label makes a sub to return empty list -- "secret"? documented? by Anonymous Monk

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