Yes, there is.
It’s exactly like @riking said:
You can try to temporarily setting UNICORN_SIDEKIQS to a higher number (e.g. 5) in your app.yml in order to process the queue a lot faster. But, this will use a lot more memory. So, make sure your machine has enough.
BTW: I was wondering if it’s possible to enqueue high priority tasks like sending validation emails before all other tasks? Does Sidekiq support this? Everyone expects emails to get sent immediately, but nobody cares about how long it takes to postprocess posts.