Loosing performance with `Threads.@threads` for loop

General Usage Performance
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11

Here are my numbers with BLAS.set_num_threads(1) for

@btime test1(1)
@btime test1(2)
@btime test1(5)
@btime test1(10)
@btime test1(20)
@btime test2()

  1.139 s (3566 allocations: 569.10 MiB)
  614.184 ms (2029 allocations: 565.13 MiB)
  308.655 ms (1080 allocations: 553.58 MiB)
  302.716 ms (738 allocations: 534.46 MiB)
  279.247 ms (526 allocations: 496.25 MiB)
  1.141 s (502 allocations: 572.62 MiB)

Scales way better!