To note, people will have wildly different tolerance to delays and lag. On the extreme, my retired parents don't feel the difference between 5s or 1s when load

To note, people will have wildly different tolerance to delays and lag. On the extreme, my retired parents don't feel the difference between 5s or 1s when loading a window or clicking somewhere. I offered a switch to a new laptop, cloning their data, and they didn't give a damn and just opened the laptop the closest to them. Most people aren't that desensitized, but for some a 600ms delay is instantaneous when for other it's 500ms too slow.