Because of the format this question is in, it was a toss up between posting it to this site or Skeptics, but I went for here in the end because I'm probably more likely to get a definitive answer.
Fun fact: A modern CPU can decrypt AES at several gigabytes per second, at like 3% usage. Seriously this isn't even a consideration anymore.
To me, the word "modern" here seems to imply "average", and it's this that made me suspect hyperbole when I initially came across the claim. I find it hard to believe that the average CPU can do this based on my own experiences of using several different RAR-cracking programs to password-crack WinRAR files that employed AES encryption.
I was able to average only 200 p/s on my Dual-Core i3-2100, and all the programs I used took the better part of a day to work their way through a plain-text dictionary of several million passwords. In addition, this was always achieved by pushing the CPU to its limits at 100% usage. Granted, the i3-2100 is no longer a modern CPU, so perhaps it's possible that CPUs released in the last year or so have improved dramatically, hence why I'm here asking the following questions.
Is the average CPU produced in 2017 capable of decrypting AES at several gigabytes per second?
Would such a CPU be capable of doing so at just 3% of its usage?
Does the quote in question misrepresent or over-simplify the topic, or is it fairly accurate?
Disclaimer: I'm by no means an InfoSec professional, nor have I studied information security in any depth, so I apologise in advance if I'm speaking from a place of unforgivable ignorance here.