Creating multiple BenchmarkResult instances is slow

[assignUser]

During local testing I noticed that creating ~1k BenchmarkResult() instances takes 30+s. This is of course nothing really super bad but after a cursory look I think the main reason for the slow down is the gathering of system info. This could obviously be cached/memoized no reason to call git a thousand times, the hardware is pretty unlikely to change within one run ^_^

[austin3dickey]

Yikes! Yes, related: #655 (comment)