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"boinctasks64.exe" is using on average 84-85% of the cpu and my system becomes almost unusable. That is with boinctasks only running in the background, not with it opened on the desktop.

You might want to try disabling your Virus scanner / Firewall to make sure this isn't causing the overhead.

And history is disabled or enabled?
With the history disable BoincTasks should do nothing when minimized.

What you can try is exit BoincTasks.
Open regedit
Computer\HKEY_CURRENT_USER\Software\eFMer\
Rename BoincTasks into BoincTasksx

Restart BoincTasks.
That should set some settings to default, that might help.

Disabling Both firewall and antivirus made no change to the behaviour.

Disabled history, no change.

Made the change to the registry.  Am able to now use boinctasks. CPU usage is still around 85% for "boinctasks64.exe"

Have run full system antivirus scan, nothing found.

Can i backup the computers list and do a fresh install of boinctasks, then restore the computers list ?

The size of the groups range from 50-100 and they are in 5 groups.

"boinctasks64.exe" is using on average 84-85% of the cpu and my system becomes almost unusable. That is with boinctasks only running in the background, not with it opened on the desktop.

I don't use boinctasks to start boinc. i run boinctasks after i have run boinc.

Yes they are grouped.  Each instance of boinc on a computer in one group etc etc.

I use an IP address and MAC address.

All computers / instances connect successfully.

I hope i am reading the graph correctly, but i am seeing above 1900% for the Thread  "_BoincTasks" 

If it's the vertical axis with % yes.
_BoincTasks is the main program, so something keeps it busy.
What's the load of your computer.
How many computer are connected to BoincTask?

Without Boinc running any wu's around 5%.

Currently there are 348 Computers.  Most of them are NCI instances.

I hope i am reading the graph correctly, but i am seeing above 1900% for the Thread  "_BoincTasks" 

I monitored task manager in windows 10 (1909) and the boinctask executable is using all spare cpu cycles, even after update of system os and reboot. i am using version 1.80.

• close the BoincTasks window not the program itself and see in the usage drops.
  BoincTasks can be very active if if displays many taks, it goes dormant the moment the display is invisible.
  Using the space CPU is relative, how much compared to the whole CPU usage.
  

Closing the BoincTasks window made no difference. Is there a theoretical / practical limit as to how many computers it can monitor at once ?

I monitored task manager in windows 10 (1909) and the boinctask executable is using all spare cpu cycles, even after update of system os and reboot. i am using version 1.80.

I have recently setup BoincTasks and was working fine and now the CPU usage is 100% of an AMD 3900X.

Don't know of any changes that have been made to the system. Any help would be great.