TLDR: Time marches on and along with cpu improvements come instructions and other benefits not immediately visible to the end user. which is still quite ahead of a PowerMac G5.
A Celeron 2955U is roughly equivalent in performance to a Core 2 Duo E4700 or an AMD Athlon 64 x2 5200+. (Acer C720P Chromebook, for example came out in 2014 and has a Intel Celeron 2955U and ) It was still an architecture that is/was ELEVEN YEARS NEWER. So even if your laptop from 2014 onward didn't include AES instructions like some Intel Atom/Celeron/Pentium models. Your laptop from 2014 was already running at LEAST a 64bit CPU and likely has AES instructions as they were introduced in 2010 The most powerful Power Macs with non Intel CPUs were discontinued in 2006. Power7+ came out in 2012 which was the first gen of Power CPUs to include AES acceleration.
