It's about 0.3kbps-62.5kbps
[8, 63] bytes
Supported; This feature can be configured using the AT+CWAUTOCONN command.
Maximum of 32 bytes.
The total length of each AT command cannot exceed 256 bytes.
Username and password length allowable range: [1, 1024] bytes.
Username and password length allowable range: [1, 1024] bytes.
Supported values: 0, 1, 2; Default is 0.
Maximum domain name length: 128 bytes; Maximum port: 32 bytes.