# Re: Article: Increasing the D Compiler Speed by Over 75%

```On Tuesday, 30 July 2013 at 10:08:22 UTC, Leandro Lucarella wrote:
```
```JS, el 29 de July a las 22:32 me escribiste:
```
```On Monday, 29 July 2013 at 19:38:51 UTC, Walter Bright wrote:
>On 7/29/2013 12:08 PM, JS wrote:
```
>>Trying to use distance and speed as a measure of performance >>of
```>>a program is
>>just ridiculous.
>
>If you google "program execution speed" you'll find it's a
>commonly used term. "Lines per second" is a common measure of
```
>compiler execution speed - google "compiler lines per second" >and
```>see.
>
>
```
>>(again, if we started with 12 second and went to 21 seconds, >>it
```>>would be a near
```
>>75% increase. But a 75% increase is not a 75% >>decrease!!!!!!!!)
```>
```
>Speed is the reciprocal of time, meaning a decrease in time >is an
`>increase in speed.`
```
You are right, sorry. There is no difference.

```
I think the issue is interpretation. When I read "X% increase in
```speed" I think "X% faster [in time]".
```
```
```
I just want to point out that being so much people getting this wrong
```(and even fighting to convince other people that the wrong
```
interpretation is right) might be an indication that the message you
```wanted to give in that blog is not extremely clear :)

```
That was my whole point. If you used some easier measure to understand (like using time instead of speed) you could have avoided all this
```confusion :)
```
```
```
It depends on the audience, but to write an article that is informal then use a very formal definition of speed is just begging for problems.
```
```
It's hard for me to really imagine that lines is a measurement of distance and speed is lines per second... but even if I allow this I don't understand why it is a better metric than just time alone(even though it is equivalent mathematically it is a convoluted approach).
```
```
If a compiler can compile n lines per second, is that really all that useful as a direct measurement? Are you saying I have to go count the lines of code in my program? Do I count empty lines? commented lines? etc... Why don't you just give me the most direct answer?
```
```
Time is really all that matters, everything else is just obfuscation.