Why are there significantly different performance results using openssl speed when using -aead and not using it?

If I take the following two commands, the results between the two are incredibly different:
openssl speed -aead -evp AES-128-CBC-HMAC-SHA256 -seconds 30
openssl speed -evp AES-128-CBC-HMAC-SHA256 -seconds 30
The results for the first look … Continue reading Why are there significantly different performance results using openssl speed when using -aead and not using it?