Mattermost gets laggy when there you are following many threads. To the point that opening the "threads" tab fail to load with timeout errors. See github issues below:
https://github.com/mattermost/mattermost/issues/23690#issuecomment-2611855763

This is true to people that have been using mattermost for a while now, we have been using it for 6 years and using collapsible threads since they are in beta.

Being able to mass unfollow all past threads will fix this.

I have tried disabling threads in the whole organization and re-enabling it but it didn't remove the follows.

If there's any backend/sql command i could run that would be appreciated as well.