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No need for hand-waving, there are publicly available benchmark results: https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

It's not the only benchmark in town and it needs to be taken with a grain of salt, but so does every benchmark.

Latner himself (creator of Swift) said Swift had speed issues because of ARC that they were hoping to solve with better code analysis. Did they?

They have been improving this steadily (I would argue it is rarely an issue nowadays, and there have always been simple workarounds), but there’s no reason a solution to the problem mentioned in the article should need to use ARC, and should use structs/protocols instead (which don’t use reference counting). I’ve seen a lot of Benchmarks that rate Swift poorly because of this.

The optimized version of C# is not really optimized as there are things left in the table that could be much close to C++.