when to think about a message queue tho

hey everyone, ive been thinking a lot about async processing lately. we have a few services that are getting bogged down with background tasks like sending emails or processing images. i know message queues can help decouple services and handle spikes in load, but im curious about the tipping point. when have you found yourselves saying, 'ok, we really need a message queue for this'? what were the specific pain points that led you to that decision