On Sunday, 11 December 2016 at 02:46:58 UTC, Nicholas Wilson wrote:

join performs allocations which is probably the reason for its slowness. There is joiner (in std.algorithm.iterations) that lazily performs the join, (though in the case of this "benchmark" will be cheating because you don't do anything with the result, print it to get a more fair comparison) avoiding allocation.

see also appender (in std.array) for fast concatenation.

Thanks, Stefan and Nicholas. I think joiner did the trick (for 50M iterations, ~2s for D, ~17s for Python).

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