The problem is that your thought is at the level of sentences with your muscle memory being automatic and your visual system mainly scanning for errors. Your “what character do I type next” at speed is less likely to be driven via visual feedback and more by direct proprieception / tactile feedback. Also, it’s not like you have a fixed 100ms delay between each character -the display system is asynchronous and will effectively batch everything up. So that 100ms delay means 100ms after your most recently typed character, not an additive 100ms delay.
Again, I’m not saying you won’t notice it, but I know I’m a very fast typer and when I was working on Oculus AirLink we had a prototype virtual desktop thing and I know I personally didn’t really notice any lag despite our internal metrics saying ~100ms of latency (we’d artificially inject extra latency for studies). It may be people differences, but keep in mind that how you measure is also important and almost no one measures true key stroke to display latency nor do they run human factors studies to accurately characterize if there really is anyone who does notice it (even at Oculus - most studies are very poor quality often with limited sample size, skewed population, and very poor reproduction/analysis because the time allotted for these projects is just enough to try to get guidance on next steps)
Again, I’m not saying you won’t notice it, but I know I’m a very fast typer and when I was working on Oculus AirLink we had a prototype virtual desktop thing and I know I personally didn’t really notice any lag despite our internal metrics saying ~100ms of latency (we’d artificially inject extra latency for studies). It may be people differences, but keep in mind that how you measure is also important and almost no one measures true key stroke to display latency nor do they run human factors studies to accurately characterize if there really is anyone who does notice it (even at Oculus - most studies are very poor quality often with limited sample size, skewed population, and very poor reproduction/analysis because the time allotted for these projects is just enough to try to get guidance on next steps)