...
Run a fast benchmarking suite with
openssl.exe speed rsa4096
There are several different algorithms/number of bits you can try like
aes
orrsa512
.You can also run without extra arguments for the full benchmark suite, it takes a considerable amount of time.
Blog Post
You can find the blog post for the investigation here: https://www.linaro.org/blog/openssl-for-windows-on-arm/