> I think "two times faster" would mean "twice as fast", not "three times as fast".
I don't see how that's the case. What is "50% bigger"? I understand it as 150% of the size. Similarly, I would understand "90% bigger" to mean "190% of the size" and "100% bigger" to mean "200% of the size", and I'm sure that is how they are used in practice.
So then surely "200% bigger" means "300% of the size"? And "two times bigger" - which is mathematically identical to "200% bigger" - would be three times the size. I acknowledge that the phrase is often used like you say but I don't think that is its literal meaning, and if you used that in a contract I think it would legally be interpretted in the way I've said (I'm thinking of consumer law in a situation where something is "n times bigger for the same price").
All this applies analagously to speed and x times faster. I gave the examples above with size because I think it's a bit more of a common thing to talk about this way and speed is a bit more subtle because what we're measuring here is the time which is something / "speed" and here the numerator isn't clear (number of training runs perhaps).
Interestingly, in Russian "100% bigger" and "two times bigger" will have different prepositions, so it's more clear that in the first case you do sum (x + 100%x = 2x), and in the second case you do multiplication (2 x = 2x).
I'm quite sure it's the same in English (sum with % and multiplication with times), but I'm not a native English speaker.
I'm a native English speaker, I don't think I would ever say "two times bigger", sounds like bad grammar. I would read "2x the size" as "twice the size" or "two times the size", but not "add on twice the size".
So I agree with the article, "3.5 times faster (1 hour vs. 3.5 hours)" is perfectly correct, and it is OK to abbreviate "3.5 times" as "3.5x".
I don't see how that's the case. What is "50% bigger"? I understand it as 150% of the size. Similarly, I would understand "90% bigger" to mean "190% of the size" and "100% bigger" to mean "200% of the size", and I'm sure that is how they are used in practice.
So then surely "200% bigger" means "300% of the size"? And "two times bigger" - which is mathematically identical to "200% bigger" - would be three times the size. I acknowledge that the phrase is often used like you say but I don't think that is its literal meaning, and if you used that in a contract I think it would legally be interpretted in the way I've said (I'm thinking of consumer law in a situation where something is "n times bigger for the same price").
All this applies analagously to speed and x times faster. I gave the examples above with size because I think it's a bit more of a common thing to talk about this way and speed is a bit more subtle because what we're measuring here is the time which is something / "speed" and here the numerator isn't clear (number of training runs perhaps).