Performance problems with Swift 4.2

[twof (Alex Reilly @ Home)]

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Performance issues with Foundation.Data

I like the idea of Foundation's Data type a lot (the equivalent of a RawPointer for managed data storage), but every time I try to use it, it ends up making everything really slow. Benchmark used is available here. Make sure to compile it with -O. Most of the printouts are to make sure the optimizer doesn't remove things, they can be generally ignored and were removed from the output posted here. First, simply allocating a Data takes 2.5 times as long as it does for array Here's a comparis…