Ticking checkboxes is very slow

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Summary

Toggling checkboxes is very slow. This practically prevents checking more than one at a time, leading to nano-workflows evolving around "how to use the checkbox update time efficiently".

Steps to reproduce

• Have an issue with - [ ] item checkboxes.
• Click on the checkbox.
• Wait for page to update.

Example Project

This very issue.

Also on our self-hosted Premium (12 seats) instance.

What is the current bug behavior?

Update takes a noticeable time, which feels much too slow for such a simple action.

What is the expected correct behavior?

Update should feel instantaneous.

Relevant logs and/or screenshots

Status: 200
Version: HTTP/2
Transferred: 6,32 kB (12,28 kB size)
Request Timing:
    Blocked: 0 ms
    DNS Resolution: 0 ms
    Connecting: 0 ms
    TLS Setup: 0 ms
    Sending: 0 ms
    Waiting: 1,68 s
    Receiving: 0 ms

Output of checks

This bug happens on GitLab.com

Possible fixes

Don't lock the UI until there is a server response? Or maybe get a short notification that there are no other updates pending?