Task manager shows CPU usage from svchost local service
Tsk. Too slow replying. Okay, can you use Process Explorer to find which instance of svchost is doing this? The Properties box will help narrow it down to one or two areas.
Although this started after VS update restart, and stopped if I disabled VS realtime scanning, it turned out to be a font that wasn't installed properly.
I checked svchost services, went to services that were listed in svchost and disabled those I could untill cpu usage dropped to normal.
Windows font cache service was culprit.
Had installed several fonts last month, uninstalled them, rebooted all was fine.
Reinstalled fonts and all is well.