nextcloud / nextcloud/whiteboard

High bandwidth spike (50Mbps+) during element dragging causing freezing

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#409 3 comments 1 reaction 0 assignees View on GitHub

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bug
Dominant language
JavaScript
Stars
215
Forks
39
Avg merge
1d 3h
Merged PRs (30d)
32

Description

When dragging elements in Whiteboard collaboration, the network bandwidth spikes to 50Mbps+ (observed via browser DevTools/network monitor), triggering my server's rate limits. As the dragging operation continues, the lag gets progressively worse until the dragged element completely freezes. This does not occur on excalidraw.com (2 - person test: stable at <5Mbps during dragging).

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing a two-person dragging session in the Whiteboard and inspect the browser DevTools network monitor while the bandwidth, lag, and freezing develop. Compare the results with excalidraw.com; done means dragging no longer causes the reported 50Mbps+ spike, progressive lag, or freeze.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript
Domain
frontend, networking, performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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