collections, inserters, seconds
1, 1, 227.454195
1, 2, 192.734583
1, 4, 188.639523
1, 8, 188.017634
1, 16, 188.130420
1, 32, 189.805933
2, 1, 162.709868
2, 2, 164.275304
2, 4, 167.812105
2, 8, 173.422124
2, 16, 180.139198
2, 32, 178.674909
4, 1, 168.226613
4, 2, 171.875465
4, 4, 159.365080
4, 8, 160.180569
4, 16, 160.778992
4, 32, 164.504062
8, 1, 155.992595
8, 2, 155.707146
8, 4, 162.473254
8, 8, 167.009526