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Plotly works pretty well (which I suspect you're alluding to) and it works completely offline, no need to upload any data to their cloud.

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Not my experience at all. After a couple thousand data points it becomes completely useless to the point that it completely freezes a jupyter notebook on my 64 core threadripper. Just trying to zoom can take minutes. It's a total joke.

That's odd. Are you sure this is not related to Jupyter? I use plotly.js via a Rust wrapper (https://github.com/igiagkiozis/plotly) and the performance seems ok when generating a static, interactive html. The wrapper language itself should be irrelevant here. Is it the same if you generate a static html-file? (EDIT: I only view the html in a browser as is, no notebooks)

While I can't speak for millions of data points, generating a gyroscope plot with x, y, z, where each gyro axis is 400k+ samples is fine performance wise. This is generating a static, interactive html. Zooming etc is fine on my M1 MacbookPro 13" - delay when zooming in this specific case is maybe 0.5secs. The html-file is 60mb+.

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