There is some delay as there are restrictions on how many messages it can send. But it should be maybe 2-3 seconds, not 10, unless you’re sending lots of messages. That said, Discord has been behaving a bit odd lately, so it might just be delayed on their side.
Viewing post in Discord to Twitch & YouTube Relay comments
Hey! Glad to hear it’s working now. Sorry, currently there are no plans to release a similar relay for YouTube. The reason is that there are rate limits for how many messages can be sent out in YouTube Chat and all SAMMI users share the quota, so relaying messages would not be a good idea and something I encourage in the first place. Hope that makes sense! :)