Mods:

CreativeCore is actually 2.0.10

On my server that has many tab completions when initially doing /, the client will freeze for a moment while it loads everything. This does not happen without the CreativeCore mod. There are also no logs or errors outputted.

Here's a video of it happening.

Fixed in the newest version. Removed the client commands and switched to the new forge client commands.

I hope it's fixed in the newest version of CreativeCore.

It seems to still be a problem :(

Which version are you using?

CreativeCore_v2.1.3_mc1.16.5

Can you provide me more information? Can you send me a list of all mods you are using. What server are you connected to?

(Still not sure why it shows CC as 2.0.0, as it's definitely the latest one from Forge)
The server is my own (silverstone.servegame.com) so I'll have a lot more commands than most people, although it may still happen for others

The server has no mods installed but if you'd like a plugin list I can get that for you

Can you show me what the server has installed? Also the ingame versions are not up to date (at least not from my mods).

Yes would be helpful.