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Adding N annotations takes O(N^2) time #5316

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P2considered for next cycle bugsomething broken performancesomething is slow
@amari-ca

Description

Plotly is unreasonably slow to add more than a few hundred annotations to a plot. This code

import time
import plotly
fig = plotly.graph_objects.Figure()
NUM_ANNOTATIONS=1000
start_time = time.monotonic()
for i in range(NUM_ANNOTATIONS):
 fig.add_annotation(
 x=i,
 y=time.monotonic() - start_time,
 text=str(i),
 )
 print(i)
fig.update_layout(
 xaxis_range=[0,NUM_ANNOTATIONS],
 yaxis_range=[0,time.monotonic() - start_time],
 xaxis_title_text="# Annotations",
 yaxis_title_text="Cumulative Time [s]",
)
fig.show()

produces this plot

Image

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