I have on request submitted a system report to Avast support. My case has now been referred to another "level".
They have asked me to:
You have installed Malwarebytes.
We do not recommend you to use more than one security application on one computer. This may cause a lot of conflict.
Can you try uninstall Malwarebytes and then restart your PC, please.
Also I would recommend you run the Boot-time scan in Avast, by following these steps:
a) Open Avast by double clicking on the orange "a" ball in the task bar.
b) Update virus definitions in the ‘SETTINGS – Update’ section
c) Click SCAN and then Scan for viruses.
d) From the drop down menu choose ‘Boot-time scan’ and click ‘Start’.
I personally have often complained that since the release of version 2, Malwarebytes uses a lot of resources.
On my system, it isn't Avast but MB that's hungry:
When I first start the system, It's Malwarebytes that's hogging my HD activity
and for a pretty long period of time. Hopefully there'll be an answer every one can live with.
I'm currently toying with the idea of turning off the resident part of Malwarebytes and going back to doing my scan's manually.