Congrats to D / Vibe-D -- techempower Round 15

[Johan Engelen]

On Thursday, 15 February 2018 at 19:04:53 UTC, Benny wrote:
> https://www.techempower.com/benchmarks/#section=data-r15&hw=ph&test=plaintext
> https://www.techempower.com/benchmarks/#section=data-r14&hw=ph&test=json
>
> D is finally showing up in the upper and middle parts of the 
> tests. In some tests Vibe-D ( with LDC ) is showing a 10 to 80 
> times improvement compared to Round 14 ( where D was stuck at 
> the bottom of the tests ).

Does anybody know what exactly has changed to explain this large 
performance difference?