Runtime Broker is a service called Time Broker, which can be disabled through editing the registry.
Go to RUN and type regedit.exe and select OK.

Find the following entry and change the 3 to a 4....

One thing I've noticed about the 29 July version vs the earlier 10240 version of Windows 10. The Runtime Broker is better behaved. It doesn't run continually any longer, taking up to 40% of CPU. Now...