docs: Add a Performance section for Typed Memoryviews (GH-4464)
docs: Add a Performance section for Typed Memoryviews (GH-4464)

Originally discussed here:
https://groups.google.com/g/cython-users/c/rU0_mt3Vgn0

da-woods/cython,cython/cython,scoder/cython,cython/cython,scoder/cython,cython/cython,da-woods/cython,da-woods/cython,scoder/cython,cython/cython,da-woods/cython,scoder/cython