27 ms·

45% slower means..? Suppose native code takes 2 units of time to execute. “45% slower” is??? Would it be 45% _more time?_ What would “45% _faster_” mean?

huflungdung 11mo ago
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azakai 11mo ago
0% slower means "the same speed." The same amount of seconds. 10% slower means "takes 10% longer." 10% more seconds. So 45% slower than 2 seconds is 1.45 * 2 = 2.9 seconds.
oersted 11mo ago
It’s a fair point, that way of expressing it is always a bit confusing. Is it the original time plus 45%? Is it 45% of the original speed? I think it is easier to understand in terms of throughput. So 45% less work per unit of time, so 55% of the work.
tharakam 11mo ago
I guess it is clearer if expressed like "Native application took only x% of WASM equivalent".
gjm11 11mo ago
What looks like the relevant table has a summary line saying "geometric mean: 1.45x" so I think that in this case "45% slower" means "times are 1.45x as long". (I think I would generally use "x% slower" to mean "slower by a factor of 1+x/100", and "x% faster" to mean "faster by a factor of 1+x/100", so "x% slower" and "x% faster" are not inverses, you can perfectly well be 300% faster or 300% slower, etc. I less confidently think that this is how most people use such language.)
- degamad 11mo ago
  What would 300% faster mean? If the original process took 30 minutes to process 10 items, how long would the 300% faster method take?
  - fainpul 11mo ago
    300% faster = 400% original speed = 4 times as fast = 1/4 the time
    - degamad 11mo ago
      Of course, my mind glossed over the point that the factor is being applied to the speed, so 300% faster than 20 items per hour is 80 items per hour. That makes sense. It's also analogous to "300% more than 20 is 80". But then it's hard to make sense of the idea that 300% slower is 5 items per hour (if I'm understanding correctly), since it works differently from "75% less than 20 is 5".
      - fainpul 11mo ago
        Yeah, "more slower" is indeed a weird way to phrase something. People should just refer to the absolute values, not to the differences. E.g. "1.4 times as fast as …" or "1/2 as heavy as …". If I read "300% slower", I like to think about time, not speed. 300% more time = 400% original time = 4 times as long = 1/4 the speed
        degamad 11mo ago
        And that's where the confusion comes from: according to this, 300% faster refers to 300% more speed, whereas 300% slower refers to 300% more time.

huflungdung 11mo ago

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azakai 11mo ago

0% slower means "the same speed." The same amount of seconds. 10% slower means "takes 10% longer." 10% more seconds. So 45% slower than 2 seconds is 1.45 * 2 = 2.9 seconds.

oersted 11mo ago

It’s a fair point, that way of expressing it is always a bit confusing. Is it the original time plus 45%? Is it 45% of the original speed? I think it is easier to understand in terms of throughput. So 45% less work per unit of time, so 55% of the work.

tharakam 11mo ago

I guess it is clearer if expressed like "Native application took only x% of WASM equivalent".

gjm11 11mo ago

What looks like the relevant table has a summary line saying "geometric mean: 1.45x" so I think that in this case "45% slower" means "times are 1.45x as long". (I think I would generally use "x% slower" to mean "slower by a factor of 1+x/100", and "x% faster" to mean "faster by a factor of 1+x/100", so "x% slower" and "x% faster" are not inverses, you can perfectly well be 300% faster or 300% slower, etc. I less confidently think that this is how most people use such language.)

degamad 11mo ago
What would 300% faster mean? If the original process took 30 minutes to process 10 items, how long would the 300% faster method take?
- fainpul 11mo ago
  300% faster = 400% original speed = 4 times as fast = 1/4 the time
  - degamad 11mo ago
    Of course, my mind glossed over the point that the factor is being applied to the speed, so 300% faster than 20 items per hour is 80 items per hour. That makes sense. It's also analogous to "300% more than 20 is 80". But then it's hard to make sense of the idea that 300% slower is 5 items per hour (if I'm understanding correctly), since it works differently from "75% less than 20 is 5".
    - fainpul 11mo ago
      Yeah, "more slower" is indeed a weird way to phrase something. People should just refer to the absolute values, not to the differences. E.g. "1.4 times as fast as …" or "1/2 as heavy as …". If I read "300% slower", I like to think about time, not speed. 300% more time = 400% original time = 4 times as long = 1/4 the speed
      - degamad 11mo ago
        And that's where the confusion comes from: according to this, 300% faster refers to 300% more speed, whereas 300% slower refers to 300% more time.