Monday August 28, 2023


Less than 1% of users may be experiencing slowness when loading Slack

Issue summary:
On August 28, 2023 from 4:30 AM PDT to 10:30 AM PDT, less than 1% of Slack users encountered slowness when loading channels, DMs, and threads. Some impacted users were also unable to load the sidebar.

We found that a host that caches workspace member, channel, and integration data was impacted by timeout errors. This prevented users on some workspaces from routing to the host and, in turn, reaching their cached data.

We restarted the affected host, cleared the associated cache for impacted workspaces, and asked affected users to reload their Slack apps. This combination of steps resolved the issue for all users.

We're continuing to investigate what caused the timeout errors to prevent future reoccurrence.

9:54 AM PST

Users should no longer be experiencing any issues with slowness when loading or sending messages in channels and DMs. Apologies for the trouble today and thank you for your patience.

11:39 AM PST

We’re still actively investigating an issue loading Slack. In particular, users may be experiencing slowness when loading or sending messages in channels and DMs. We’ll provide another update as soon as we have more information to share.

9:37 AM PST

Users may be experiencing trouble loading their DMs, channels, and sidebar in Slack. We’re investigating and will let you know as soon as we know more. We appreciate your patience in the meantime.

9:09 AM PST

Services affected