Workflow jobs not started in timely manner

We’ve seen extremely slow workflows today. Instead of what took ~20m yesterday, we’ve seen 1h 6m today.

The reason seems to be in scheduling, separate jobs take similar amount of time, but jobs stay in the pipe for too long and are not started.

Workflow in discussion was ddebb1d8-b01d-4de3-9389-464ab1c999bf.