That clock I'm racin' it
Double timin' it, but I still spit triple the amount
Of insults in a tenth of the time

from T.I. (Ft. Eminem) – That's All She Wrote (Alternate Eminem Verse) Lyrics on Rap Genius

Meaning

That clock I’m racing it, double timing it
But I still spit triple the amount of insults in a tenth of the time

He is referring to the fact he raps twice as fast to fit some of his lines in. This being amazing in itself. Unlike Lil Wayne, who raps at halftime.

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