Plotly scatter click is unreliable and slow in Streamlit

Using Streamlit
1

I’m building an embedding visualizer for drift detection using Streamlit + Plotly. I need to:

  • Click on a scatter point (embedding)
  • Get a URL from customdata
  • Load and display the image

I’ve tried using streamlit-plotly-events2 and also st.plotly_chart(..., on_select="rerun"), but both approaches are either too slow (2–3s lag) or don’t reliably capture multiple clicks.

Here’s a minimal working example ):

clicked_points = plotly_events(fig, click_event=True, key="plot_click")
if clicked_points and 'pointIndex' in clicked_points[0]:
    idx = clicked_points[0]['pointIndex']
    url = current_urls[idx]
    st.image(fetch_image_from_url(url))  # simplified

But clicks are flaky — sometimes the plot refreshes but no point is selected. Other times it’s just slow.
How do i

  • Reliably capture click events?
  • Extract customdata from the clicked point?
  • Avoid the latency or missed clicks?

Any working example or guidance would be appreciated!Im doing it in my local itself

2

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