Is LVGL the fastest there is for drawing?

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I’ll ask @kisvegabor to take a look at this and also respond with my thoughts here.

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@Bruce_B

Is LVGL standard use is without x11 and direct to framebuffer using this:

LVGL can do both. It can use SDL in order to render within a normal X11 window, or it can render to the framebuffer directly.

[quote=“Bruce_B, post:1, topic:4699”]
Is there a lower level than kernel framebuffer as well for graphics in software? or no rest is hardware and one can not access it using software?[/quote]

In general, for a 2D application, I think the framebuffer is the lowest-level interface.

@Bruce_B

I am ditching all other libraries in favor of speed and going right down to lowest layer. Is my approach for speed correct?

I should note that the chart widget is not the most optimal for high speed redrawing of large amounts of data, as mentioned by @kisvegabor here. If you are looking for the maximum possible speed, you may have to use a canvas widget and write a line plotting algorithm yourself.

@Bruce_B

to send all data over network to me and to run LVGL on my client-side PC whichever gives me the fastest response to see on screen. Which approach is correct?

Sending the financial data over the network and plotting it locally is likely to be faster, as the VNC option would require you to send large chunks of the screen for each frame that’s redrawn.

@Bruce_B

Are there any examples of financial data charting with LVGL?

Not that I’m aware of. It’s an interesting use case!