I'm worried about performance in a Data Lake used for Data Science purposes. I need to encrypt confidential data and, because of definitions I won't dive into here, the algorithm to fulfill this requirement has to be AES-256.
However, I'm well aware that, under the assumption that everything else has been done just fine, AES-128 is more than enough to secure my data.
There's also a benchmark made by Crypto++ that shows how practically slower AES-256 can be when compared to AES-128, but I don't believe I can use this benchmark to all kinds of implementations.
The question is: Am I exaggerating my concerns in the reduction of performance when using either AES-128 or AES-256?