My system was running a bit slow/unrfesponsive and then i spotted this on my system monitoring page
The box only has 4 cpu's so it should only really run 4 jobs with 4 queues to be 100% utilised. I might be a tad over that. it was up at 800% + but by the time i snapped it it had fallen back a bit. Glad these are just test systems. though gives me food for thought for live deployments.