Ive had some partial success, bare in mind this is working with fresh clean install off a USB disk 1803 created today so is the latest version. Fresh install with all drivers only from MS and all updates error still occurred. Ive managed to get the HP
laptop to boot and if you wait about 5 seconds from desktop you wont get the error opening 'settings', if you open it immediately on desktop you will still get it.
I removed 'skype' app from apps and features.
I disabled 'Onedrive' from running at startup.
I also disabled 'tips and notifications' from system (this had no effect on its own)
I trimmed down 'msconfig' 'services' (hide microsoft) to bare minimum, also disabled notifications from defender and stopped onedrive here also.
The first two made the difference, the laptop boots so much quicker but this error does occur if you try access settings immediately after booting, not if you give it a few secs. The operation of the laptop is now so much better but the problem is not rectified
fully.
From what i read 'runtimebroker.exe' had a revamp in version 1803, it now runs separate instances for every app rather just one instance, the overheads always appear to come from 'system services' when viewing 'performance'.
I cannot believe there are hardly any other posts about this, ive been looking for weeks since 1803 was released and this problem surfaced, i guess its a case of either being patient or hoping for the update fix.