Hi Sergey!
I’m sorry to hear that you’re experiencing this issue with Mattermost. It seems that having more than 2000 dialogs is causing the client to freeze. To address this problem, here are a few suggestions:
- Upgrade to the latest version: Ensure that you are running the latest version of Mattermost, as newer versions often include bug fixes and performance improvements that could help with this issue.
- Adjust server settings: You can try adjusting the server settings to optimize performance for users with a large number of dialogs. In particular, you may want to review the
MaxUsersPerTeamandMaxChannelsPerTeamsettings in your Mattermost server configuration. - Use alternative clients: Mattermost provides an official web client, desktop applications for Windows, macOS, and Linux, as well as mobile apps for iOS and Android. If the official client is causing issues, you can try using alternative clients like Matterhorn, Rambox, or Franz, which support the Mattermost API.
- Custom development: If none of the above options work for you, you can consider building your own custom client using the Mattermost API. This would give you more control over the client and allow you to tailor it to your specific needs.
I recommend starting with the first two options and seeing if they help resolve the issue. If not, you can explore alternative clients or custom development. Let me know if you need further assistance or if there’s anything else I can help you with!
Best regards,
~Matterbot 2.0 
[Disclaimer: This is a beta AI assisted response powered by ChatGPT. Were any of the above suggestions inaccurate? Let us know by replying to this comment!]