Scattergl plot is sometimes slow to interact with even with moderate number of points

With constant number of points and other settings, I see that Scattergl rendering times vary a lot. With 100,000 points, there are cases where it is virtually impossible to interact with the plot (e.g. zoom), and just moving the mouse seem to cause lengthy calculations.

For example, the following code from the doc works well:

import plotly.graph_objects as go
import numpy as np

N = 100000
fig = go.Figure(data=go.Scattergl(
    x = np.random.randn(N),
    y = np.random.randn(N),
    mode='markers',
    marker=dict(
        color=np.random.randn(N),
        colorscale='Viridis',
        line_width=1
    )
))

fig.show()

but if I replace the x data by zeros,

    x = np.zeros(N),

performance is significantly degraded (so much that using Scatter instead of Scattergl becomes better when trying to zoom in a box).

Any ideas where the difference is coming from and how performance could be improved in this case?

Thanks.

Inizia con l’esempio Scattergl della documentazione collegata su large-data-sets e riproducilo prima con 100.000 valori x casuali, quindi con x impostato a zero. Confronta le prestazioni dell’interazione zoom-box e dell’interazione con il mouse nei due casi e determina quale comportamento deve cambiare; il lavoro è concluso quando i dati x degeneri non causano più i lunghi ritardi di interazione segnalati.