The most powerful programming language is the one you know, and I believe the same is true for speed. I know C# and PHP, for me if speed matters then I go for

The most powerful programming language is the one you know, and I believe the same is true for speed. I know C# and PHP, for me if speed matters then I go for C# just because I use it more on a daily basis. Even though I know PHP would likely be quicker if I used both equally on a daily basis.