As for it using using all your CPU while you compile, you can tell it to use less via the
-threads command. Normally I would say google your CPU to see how many threads it can use, but in your case we already know that yours has 8 because it says so right in your compile logs.
Next time you compile, switch to the advanced compiler and add
-threads # at the front, so ti looks like this:
Replace the # with the number you wish to use. As you can see I have mine set to 3. In your case, I'd say start with 6. It will compile slower, but it will take less of your CPU so you can still at least use the internet / listen to music / whatever you do.