so now i have reset the laptop keeping the user settings. essentially a reinstall of windows 10.
still no joy,
i notice that the cpu is throttled at 13% and memory does not go past 45%. someone is playing a wicked joke :)
even when i open a 30MB excel file with lots of calc the cpu does not tick past 13% (running intel i7, 16gb of memory)
surely we are not the only ones with this problem