What does running multiple jobs do to performance? If running two jobs, do you get double the speed? Three jobs triple the speed. Six jobs six times the speed?
Content creation (MergeEngine) is throttled according to the licence and will only allow the licensed rendered content pages per minute.
So if you run multiple concurrent jobs, you will likely just split this allowance across the available engines, managed by Connect Server.
Running multiple jobs in parallel doesn’t improve the speed of each job but it greatly improves overall throughput. Each individual job will still run at the same speed as before, but with parallel processing you can have several such jobs running concurrently instead of in sequence.
More information is available here: PlanetPress Connect 2021.1 User Guide - Performance Considerations