Span can be used via nuget also in .NET framework. It’s slower than in Core because of lacking runtime support, but not by that much. SIMD also was already avai

Span can be used via nuget also in .NET framework. It’s slower than in Core because of lacking runtime support, but not by that much. SIMD also was already available since 4.6 and unsafe was always there. I think what really changed was the mentality. Before low level stuff was tried to be contained and used mostly for interop. Now the value of the performance of safe low level primitives is seen.