x64 build time 3x slower?

[Moritz Maxeiner via Digitalmars-d-learn]

On Monday, 7 August 2017 at 22:19:57 UTC, Johnson Jones wrote:
> Why would that be. Program take about 4 seconds to compile and 
> 12 for x64. There is fundamentally no difference between the 
> two versions. I do link in gtk x86 and gtk x64 depending on 
> version, and that's it as far as I can tell.
>
> Debug
> x86         4
> x64         12
> Release
> x86         3
> x64         5
>
> The timings are pretty steady.

Split up the build time in compile time and link time and see how 
the difference is distributed between the two.
If it's distributed overwhelmingly to the link time it could be 
that you're using Microsoft's linker for x64 and OPTLINK for x86?