Microsoft seeks Rust developers to rewrite core C# code(theregister.com)

    var tenMillionTasks = Enumerable
        .Range(0, 10_000_000)
        .Select(async i =>
        {
            // Force the yield - this way the methods will continue the execution
            // in the form of scheduled continuations (work items), so that we pay
            // for context switching too, similar to a more realistic scenario.
            await Task.Yield();
            for (var j = 10_000; j >= 0; j--)
            {
                // This is an okay proxy for doing some work since the
                // JIT is fairly conservative and won't auto-vectorize this
                // because its computation budget is prioritized on more impactful
                // optimizations like inlining, CSE, devirtualization, etc.
                // (this is completrly compensated by portable SIMD API)
                i++;
            }

            return i;
        });

    // Scales linearly with the number of CPU cores
    var results = await Task.WhenAll(tenMillionTasks);
    var average = results.Average();

    Console.WriteLine($"Done! The avg is {average}");