*Putting on my Physicist hat*

You should be taking the actual standard deviation into account, too. Most 
likely, patchbot number one gave less consistent timings, possibly due to 
background jobs, mechanical harddisk, or memory pressure. This is why it 
failed to detect any effect, not because it is not there but because it was 
hidden in the statistical noise.  

On Friday, June 28, 2013 9:40:10 AM UTC-4, Simon King wrote:
>
> Not significantly. One patchbot found 
> +With 32% confidence, startup time decreased by at least 0.25% 
> +With 44% confidence, startup time decreased by at least 0.1% 
>
> Another found a significant but very small regression: 
> +With 78% confidence, startup time increased by at least 0.5% 
> +With 97% confidence, startup time increased by at least 0.25% 
> +With 99.4% confidence, startup time increased by at least 0.1% 
>

 

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