same issue, running v7.9 atm on HP Elitebook 840 G2

I/O write bytes might not imply disk I/O
 

This might be a misunderstanding. It might be that the Task Manager I/O write byte totals are also taking USB bus traffic into account. When my mouse is moving over the laptop’s screen, DisplayLink I/O is low. Moving the mouse around an external monitor causes lots of I/O. Meanwhile, the hard disc write speed in Task Manager is generally quiet and does not spike the way I/O write bytes does.