I agree with the article author. Performance today is not a priority for web developers. It's not even in the top ten priorities. Performance is just not considered unless it is so bad that a site looks like it isn't working. We can change this at any point we like. We won't. It will continue to get worse.
It's a shame since all hardware is getting slower and slower every day.
Why the hell does it take an application like Photoshop 30 fucking seconds to simply launch and get to where it can accept input on my 32-core, dual-Xeon desktop at work with 192GB of RAM and a very fast SSD? Because people punt the fucking problem into the future and assume everything will just continually get faster