since fitting the SSD on Sunday the machine has settled down a bit. I have Cyberfox open with 7 or 8 tabs, I have Inssider running (network monitoring programme) and have a task manager open. When the task manager is brought to the front the cpu usage shows 10-12% for a few seconds and then settles down to 2%. Memory usage is showing 45%. I have been in and stopped the windi update process although last evening it was showing only 0% flicking 1% occasionally. As before, yewtoob plays music videos without struggling so things seem good, for now.