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GeezerVison is showing github.com — Fix slow scattergl hover by emilykl · Pull Request #7998 · plotly/plotly.js

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emilykl commented Aug 30, 2026

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Closes #5927, closes #5790

Fixes performance issue where scattergl plots were performing an expensive operation searching all points on hover by default.

The impact is severe for plots with many points (say, >100k; see linked issues for details).

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emilykl added 2 commits

August 30, 2026 14:47


          add check before searching all points for drawing spikelines (perform…

b8a2938

…ance fix)


          add tests

0a69fa1

Lexachoc commented Sep 10, 2026

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Hi, I may submit PRs for #7972 (spikelines for ternary plots) and #7058 (new scatterternarygl trace) recently.

Both may overlap with the hover/spikeline logic changed here, especially this line (depending on my implementations):

plotly.js/src/components/fx/hover.js

Line 676 in 0a69fa1

if (hasCartesian && spikedistance !== 0 && canSpikeToClosest(pointData)) {

Just wanted to flag the connection so I can account for these changes.

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Lexachoc mentioned this pull request

Sep 11, 2026

[BUG]: scattergl hover freezes with more than 100.000 points all with different x but same y #8036

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emilykl mentioned this pull request

Sep 17, 2026

Fix scattergl plot freezing up on hover #8052

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emilykl commented Sep 17, 2026

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Closing in favor of #8052

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emilykl closed this

Sep 17, 2026

emilykl commented Sep 17, 2026

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Thanks @Lexachoc for the heads-up!

I've posted a more finalized version of this PR in #8052, feel free to take a look. If the PR is accepted, you could incorporate the changes into #8041.

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Successfully merging this pull request may close these issues.

Scattergl plot is sometimes slow to interact with even with moderate number of points Performance Issues with large data sets since 2.x.x

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