I aim to misbehave.
cas 1
10 threads, 50 000 items per thread, 50 times

insert diff: 219178.56
ratio: 1.070079800023923
search diff: 31958.820000000036
ratio: 0.13814536714394585

10 threads, 500 000 items per thread, 5 times

insert diff: 2822425.6000000006
ratio: 0.7085952903645223
search diff: 696840.6000000001
ratio: 0.19468277664045608