FYI: Slow to load

[PallHaraldsson]

I tried to see if faster than dancasimiro/WAV.jl#96 and neither faster than Python/scypi (also likely GC issue):

julia> @time using FileIO: load, save, loadstreaming, savestreaming
  0.421023 seconds (430.05 k allocations: 28.250 MiB, 2.66% gc time, 25.76% compilation time)

julia> @time using FileIO: load, save, loadstreaming, savestreaming
  0.000145 seconds (81 allocations: 6.062 KiB)

julia> @time import LibSndFile
  2.951508 seconds (3.38 M allocations: 211.385 MiB, 5.84% gc time)

julia> @time import LibSndFile
  1.137657 seconds (667.89 k allocations: 37.415 MiB, 2.50% gc time, 99.99% compilation time)

julia> @time import LibSndFile
  0.000129 seconds (81 allocations: 6.062 KiB)

julia> @time x = load("test.wav");
  1.406329 seconds (1.71 M allocations: 290.732 MiB, 5.59% gc time, 12.73% compilation time)

julia> @time x = load("test.wav");
  0.368146 seconds (85 allocations: 190.740 MiB, 64.69% gc time)

julia> @time x = load("test.wav");
  0.152421 seconds (85 allocations: 190.740 MiB, 9.59% gc time)

julia> @time x = load("test.wav");
  0.145860 seconds (85 allocations: 190.740 MiB, 10.45% gc time)

See the other issue. Could be enough to fix there.

[rob-luke]

Optimisation improvements are always welcome via a PR. Thanks for reporting