I wish someone figured out how to reduce latency from keypress to screen. Even the JetBrains with their "zero latency" editor is lagging like mad. How come old

I wish someone figured out how to reduce latency from keypress to screen. Even the JetBrains with their "zero latency" editor is lagging like mad. How come old underpowered computers worked perfectly whereas new beefy machines can't do such a task?