> Actions less than 100 milliseconds apart will feel simultaneous This is not true for some things and people. I would not call those simultaneous, rather bear

> Actions less than 100 milliseconds apart will feel simultaneous This is not true for some things and people. I would not call those simultaneous, rather bearable. Most users wouldn't mind it. Input delay though is very noticeable. If keyboard or mouse have 100ms delay the user might consider that their device is doing something heavy. And people who got used to fast software, e.g. optimized code editors or games, are even harder to please.