This is a problem for me too. My solution is to re-use seqs as often as possible.
I have this (in my Ubuntu14 VM):
10 * test: 2.599999999999998e-05
10 * tx: 2.000000000000049e-06
10 * t0: 2.999999999999965e-06
But in your benchmark, you need to use `i` so the compiler cannot elide any
code. When I accumulate i:
10 * test: 4.799999999999987e-05
10 * tx: 1.999999999999832e-06
10 * t0: 2.000000000000265e-06
i=21
