Summary Since updating to mattermost 6.0, whenever I switch channels in the app I have to wait from 3 to 15 seconds because of a slow /api/v4/users/<id>/channels/<id>/posts/unread?limit_after=30&limit_before=30&skipFetchThreads=false&collapsedThreads=false&collapsedThreadsExtended=false API call. S…

Hey @luca-nardelli - I am wondering if turning ServiceSettings.EnablePermalinkPreviews to false has any effect here? We are internally looking into this. But I quickly wanted to rule out this factor.

Hey, sorry for the delay in getting back to you. It seems I cannot set this option from mmctl, is this intended? Full command: mmctl --local config set ServiceSettings.EnablePermalinkPreviews false Error: selected path object is not valid

I am experiencing the same issue ever since upgrading to 6.0, set EnablePermalinkPreviews=false and rebooted. Problem remains. And like with @luca-nardelli it is the unread call I am waiting for: [image] @agnivade , what do I use with PermalinkPreviews=false? Should I set it back? Currently on 6.…

@luca-nardelli - Ensure that you are running the latest mmctl packaged with 6.0. If you are using that, then I’m not very sure why that’s happening. Are you able to set other config options? @tomz - Thanks for the confirmation. You can set it back to true if you prefer. I was just trying to isolate…

Ok, given that I don’t know what this flag does I better go back to the default=true in this case. :slight_smile:

Updated today to 6.1 and the issue is still present, it actually feels worse [image] This is when opening a private channel I have with myself (i.e. the scratch pad)

@luca-nardelli - Just to confirm here, you are seeing this with EnablePermalinkPreviews disabled?

Yeah, somehow the update to 6.1 “fixed” the mmctl issue I had previously reported. I ran the following to apply the setting (without restarting mattermost) mmctl --local config set ServiceSettings.EnablePermalinkPreviews false mmctl --local config reload By the way, reproducing the issue is not s…

@luca-nardelli / @tomz - I have another setting which I would like to run by you all. Can you also check if ServiceSettings.EnableLinkPreviews is set to true and if so, set it to false and see if that helps? EDIT: To clarify, set both ServiceSettings.EnableLinkPreviews and ServiceSettings.EnablePe…

Very slow /unread endpoint call when switching channels

Troubleshooting

amy.blais (Amy Blais) October 19, 2021, 4:39pm 2

Opened a ticket for our team to take a look: [MM-39433] Performance issues reported on 6.0 - Mattermost

Topic		Replies	Views
Switching to unread channel displays arbitrarily old messages Troubleshooting	35	3515	April 24, 2021
[SOLVED] Channel shows unread even after reading all messages Troubleshooting	1	2992	April 20, 2021
Unread direct message channels not shown in sidebar Troubleshooting	15	1706	January 22, 2025
[v11.7.1] Channel reopens at a previous-day read post instead of the unread post after Mark as Unread Troubleshooting	1	40	May 29, 2026
Channels unread messages	3	141	May 21, 2025

Very slow /unread endpoint call when switching channels

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