that is a ALWFUK [sic] lot of data to fit into IRCv3 tag
The IRCv3 messages tags standard gives message tags a max length of 512 bytes:
Size limit for the message tags MUST be 512 bytes, including @ and the trailing space characters, leaving 510 bytes for tags themselves. So the total size of a message becomes limited by 1024 bytes: 512 bytes for message tags, and 512 bytes for the rest as specified by RFC 1459
Currently, only 91 bytes(excluding emote list, displayname and user-type) are used:
@color=#XXXXXX;display-name=;emotes=;mod=X;subscriber=X;turbo=X;user-id=XXXXXXXX;user-type=