problem with DS18B20

Stm32f3discovery 1
106.5475338966%

Stm32f3discovery 2
105.9924543132%

Espruino Board 1
100%

Espruino Board 2
99.2454313225%

Espruino Board 3
98.9703281588%

Espruino Board 4
97.6832383572%

With Espruino Board 1 as a reference, I can se that my discovery board's are a lot slower, and my espruino Board 2..4 are faster.

And the DS18B20, that came with the kit, can run on my discovery, but my other DS18B20, can't run on the espruino's.

It is tested with the following code.

CODE
clearInterval();
clearWatch();

print(getTime());
for(i=0;i<10000;i++);
print(getTime());
END CODE

I think we need a variable or something so we can adjust the time.