VegaLite rendering in notebook is very slow

The following Julia code renders a 1000-point VegaLite scatter plot in 5+ seconds, or ~50 seconds for 10000-points. The Julia runtime is instantaneous, it is the render part which is slow. This slow render makes it very cumbersome to use VegaLite for visualization in notebooks

using VegaLite

npoints = 10000
[(; x = rand(), y = rand(), z = rand()) for _ in 1:npoints] |>
@vlplot(
    :point,
     x=:x,
     y=:y
)

In comparison, rendering the same 10000-point plot in a recent Chromium browser takes less than 2 seconds.

[pablosanjose]

Thanks for following up on this!

Very interesting question, I should have checked: the delay is also present in a jupyter notebook in the browser (both Vivaldi and Firefox). Same timings in macos, much slower than simply displaying the plot in the browser (i.e. running the command in the OP from a Julia REPL).

So this means the problem is not in the vscode jupyter integration. Feel free to close this then.

[DonJayamanne]

I’m sorry for not getting back to you on this, I’ll be looking into this today.