only Vsync, Update rate is capped at 4x refresh late

[Hinaxnitro]

When I set the frame limit to Vsync, the Update rate is capped at 240fps on a 60Hz monitor.

When I assume Vsync's Draw limit to display's refresh late, it's weird since other settings limit it to 2 times the Draw limit.

Is there any reason for this?

[peppy]

Having a higher update rate results in lower latency when we are running multi-threaded. This is due to the alignment of the finishing times of update and draw threads. Running the update thread at a higher rate will reduce the delay by 50% on average.

If you want to avoid this for performance / heat reasons, you can change the game thread mode to "single threaded" from settings and you'll get what you expect to see.

[Hinaxnitro]

I understand that the app needs the Update rate higher than the Draw rate.

What I wanted to ask is why Vsync's Update rate is 4 times of Draw rate while other settings are 2 times of Draw rate.
Your explanation feels that apps need even more Update rate since the monitor's timing is not stable enough.

Am I getting right?

[peppy]

it's probably set this way because running at vsync generally means you're at a much lower frame rate, so having higher update rate is helpful.