I learned alot that I will use on my next build:

• Looking out for PCIe 4.0
• The existence of cheap cards for mounting multiple nvme https://www.asus.com/us/Motherboard-Accessories/HYPER-M-2-X16-GEN-4-CARD/

As well as stuff I’ll use in my job:

• New perf tooling (lately I mostly use perf, https://0x.tools/ by the author of the article look useful)
• More info about using fio
• More about schedulers and block device readahead

I really like the speech bubble annotated stack traces. It mirrors how I often explain things to people 1:1, but I’d never considered presenting the data that way.