Hello, the fan on my 2013 late 13 Retina macbook just alerted me to high CPU usage by Canon scanner sw - ust turning the printer-scanner on leads it to some 140% CPU utilization when idle. The culprit is a task called CanonIJScanner1. When I turn on my Epson printer, then the "Epson Scanner" task consumes some 60% of CPU. Again, this is while idle. When scanning, the utilization drops to single digit percent. Since 2 drivers/tasks related to 2 devices from different vendors, I suspect this is another El Capitan bugs. I am sure I would have noticed the high CPU utilization on previous version of the OS, due to the fan noise. Reseting the printing system did not resolve this.I am on 10.11.2. Thanks for any ideas/pointers. Paul.