Slowness in sending notifications

Hey Team, we're running a self-hosted Novu instance with 12k users. When triggering a workflow using broadcast, it's taking around 40 to 50 minutes to send notifications, even though the target audience is only 30 to 40 users. Is there a reason why a step is created for every user in Novu, especially when the target audience is small? Are there alternative methods we could use? What steps can we take to reduce the time it takes to send notifications?