[seabrookmx]

Only if you didn't care about performance.

We attempted a move to mono for backend web services maybe 3 years before .NET Core released, and it was a complete no-go. 10x reduction in performance on the same hardware.

This wasn't specific to our workload either. I was big into the game Terraria at the time, and I saw similarly poor performance when running it's game server under mono vs .NET 4.x

While some of the mono toolchain was integrated into .NET Core, CoreCLR was a rewrite and immediately solved this problem.

[drzaiusx11]

Great context, thanks! I knew it worked (I closely followed mono development at the time) but I didn't have a windows license/windows machines at the time it was ongoing to compare it to. 4x is pretty bad, any ideas what went wrong? Lack of jit maybe? I forget the exact architecture of mono at that time, being like 20 years ago...

[seabrookmx]

It did have a JIT, it just wasn't a very performant one. I recall the GC implementation also being quite slow. GC is an area where .NET is still making strides.. we got a new collector in .NET 10.