Restrictions

2025-07-31

This article describes the usage restrictions of the ZEGO Express SDK room service, including rate limits, string size limits, etc.

Room

ZEGO's room service supports millions of users online in a single room. By default, the total login QPS of all users in each room is 200, which means a maximum of 200 users can log in to the same room per second.

Note

If you need to increase the limit, please contact ZEGOCLOUD Technical Support for evaluation.

Room Real-time Messages

SDK Interface	Size Limit	Sending Rate Limit (in a single room of the SDK)	Description
Send broadcast message sendBroadcastMessage	Message length cannot exceed 1 KB.	10 times/s	Message is reliable. The maximum QPS for a single user calling this interface on the client side is 2 (the interval between two calls cannot be less than 500 milliseconds).
Send barrage message sendBarrageMessage	Message length cannot exceed 1 KB.	20 times/s	Message is not guaranteed to be reliable.
Send custom signaling message sendCustomCommand	Message length cannot exceed 1 KB.	When sending to a single user: 200 messages/s When sending to multiple users: 10 messages/s	Message is reliable.

Note

The Message reliability here refers to whether the peer user can successfully receive the message when the network connection is normal.