What's a snappy .net app ? The few ones I know definitely feel slower than e.g. Qt apps

Paint.NET is probably the best example of a good, fast widely used .NET app.

That's the first example of "not fast" that came to my mind actually.

Seriously? The effort Rick puts into Paint.NET performance is unreal (check out his Twitter sometime). I've found it to be impressively fast, especially for how much functionality it has.

FWIW it was only recently migrated to a modern .NET version, give the latest version a spin if you haven't already.

Paint.NET is a good example for how much effort it takes to develop a .NET app that has decent performance especially once it is a little bit complex

Just because it's impressive doesn't mean it's not slower than other systems. It's not mutually exclusive.

Agreed. Rick’s work on Paint.NET is just so impressive.

Odd, I've been using it for the better part of a decade when GIMP is too much and I've never felt like it was slow.

Indeed, if anything is slow, it's GIMP.

More like hardware is now hiding the .Nets overheads

No, both have gotten much faster. This is just one release of performance improvements: https://devblogs.microsoft.com/dotnet/performance-improvemen...

It is worth noting that WPF can run on this latest version of .NET