The benchmarks for openssl on the 2020 Mac Mini are impressive.

$ openssl speed rc4
Doing rc4 for 3s on 16 size blocks: 196567633 rc4's in 3.01s
Doing rc4 for 3s on 64 size blocks: 59755274 rc4's in 3.01s
Doing rc4 for 3s on 256 size blocks: 15735364 rc4's in 3.01s
Doing rc4 for 3s on 1024 size blocks: 3968584 rc4's in 3.00s
Doing rc4 for 3s on 8192 size blocks: 500071 rc4's in 3.01s
LibreSSL 2.8.3
built on: date not available
options:bn(64,64) rc4(ptr,int) des(idx,cisc,16,int) aes(partial) blowfish(idx)
compiler: information not available
The 'numbers' are in 1000s of bytes per second processed.
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
rc4            1046010.67k  1271776.09k  1339563.79k  1354086.88k  1362324.84

Like the 7z benchmark, the 2020 Mac Mini is close to twice as fast as my 2015 MacBook Pro.

$ openssl speed rc4
Doing rc4 for 3s on 16 size blocks: 88227131 rc4's in 2.99s
Doing rc4 for 3s on 64 size blocks: 34107361 rc4's in 2.99s
Doing rc4 for 3s on 256 size blocks: 9773938 rc4's in 2.99s
Doing rc4 for 3s on 1024 size blocks: 2462731 rc4's in 2.99s
Doing rc4 for 3s on 8192 size blocks: 322263 rc4's in 2.99s
LibreSSL 2.8.3
built on: date not available
options:bn(64,64) rc4(16x,int) des(idx,cisc,16,int) aes(partial) blowfish(idx)
compiler: information not available
The 'numbers' are in 1000s of bytes per second processed.
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
rc4             471408.32k   729853.89k   837518.97k   843304.57k   883784.56k