how fast to 1 Billion ?

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Wiering

Coorrae's code becomes about 10% faster if you declare a right before the loop. Looking at the assembly, this compiles to add eax,1 instead of add esi,1. I would have expected a :+ 1 to be faster too, but it compiles to the same add eax,1 (instead of inc eax, which I think would be faster).

Strict 

Local start: Int 
Local finish: Int 

Delay 500

start = MilliSecs()

Local a: Int = 0
While (a < 1000000000) 
  a = a + 1 
Wend 

finish = MilliSecs() 

Print "0 to 1 Billion in " + (finish - start) + " milliseconds"