perf: speed up cov/corr with SIMD + strength-reduction ~3x 0.19.13/ ~2x numpy
#7263
| Job | Run time |
|---|---|
| 10s | |
| 10s |
~3x 0.19.13/ ~2x numpy
#7263
| Job | Run time |
|---|---|
| 10s | |
| 10s |