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In the spirit of being the change I want to see in the world, I have measured the latency of my Kobo Aura HD, running software version 4.25.15875
Procedure:
* Get an epub of "Dracula", and go to the first page of chapter 1.
* Record with a 60 fps camera.
* Smack the screen with a finger nice and quickly to get an easily measurable moment of contact.
* Wait for the page to turn.
* Repeat a total of 10 times.
* Play back the video frame by frame and measure from when the finger touches to when the page has turned and is comfortably readable.
* Convert the book to kepub and repeat the whole thing
Results:
epub:
avg latency: 1.658s
min latency: 1.574s
max latency: 1.975s
kepub:
avg latency: 1.914s
min latency: 1.832s
max latency: 1.964s
I'm surprised to see that kepub did worse. I have a very distinct memory of a noticeable improvement after converting to kepub. Maybe some of my books were pathologically slow for some technical reason, and those books were handled better by kepub.
I consider these numbers to be atrocious. Under 0.5s would be more bearable, but still objectively bad.
It's easy to prove that a majority of this slowness is because of poorly written software, not because of inherent limitations of the display. If I immediately tap to turn the page right after a previous page turn finishes, it's way way faster.
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