It's not a scientific test or anything, but the results are so marked it's almost worth not even bothering to measure it:
24k loc of C (24743 total excluding headers and comments), using ninja and cmake, without using the autofail tool suite (which ups the time taken about about 150%):
$ time make
...
real 0m16.929s
user 0m9.952s
sys 0m4.641s
23kloc of go code (23588 total excluding comments):
$ time go build
...
real 0m1.667s
user 0m1.331s
sys 0m0.214s
24k loc of C (24743 total excluding headers and comments), using ninja and cmake, without using the autofail tool suite (which ups the time taken about about 150%):
23kloc of go code (23588 total excluding comments):