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0 pointsc-smile8y ago0 comments

For that particular text editor latency of char typed to appear on screen will be 16ms (normal 60 FPS refresh rate).

Editor keeps each line in separate <text> DOM elements (like <p> but no margins and only text inside).

So we just need to relayout one particular line in order to show typed character.

0 comments

vardump8y ago

> For that particular text editor latency of char typed to appear on screen will be 16ms (normal 60 FPS refresh rate).

That's very impressive, if so. On Windows 7 with DWM (GPU display compositor) switched off?

How did you validate and measure latency?

Someone correct me if I'm wrong, but I'm under impression Windows 10 DWM adds additional latency making 16 ms latency unachievable.

c-smileOP8y ago

Not sure I understand your concerns. If you have DirectX there then you will have the same GPU rendering.

If that's about CPU rasterizers then Direct2D/WARP and Skia rasterizers are pretty good.

Problem is that if you have two monitors of the same size but one of "standard" 96ppi and another is, say, Retina grade (300+ ppi) then GPU rendering is the only reasonable option. Number of pixels to rasterize is 9 times more in Retina case. We do not have CPU performance increased 9 times...

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