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I think you're right. I think you could say the package (as in the code) is 45% faster or that the package increases parsing rate by 90%. But mixing the two is confusing.

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I think it's an interpretation issue. When you say it's 45% faster I interpret that as "the new package handles work at a rate of 145% when compared to the original, that is, 1.45 times as fast".

I would rephrase your comment as "the package takes 45% less time to process a given data set".

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