I'm not going to vote this down, but will say that it would introduce a compromised workflow. When I update a Master, I want to be absolutely sure that it has all the latest changes. If I forget something or choose the wrong element, that would be really bad.
And you are suggesting this due to a performance limitation of your computer, not of the software.
It sounds like you know how to configure your settings, but want to say to make sure you've got your buffers big before updating the master.