Process Lasso is another alternative for both temporary adjustments to the priority class of background processes, default priorities, default affinities, default I/O priorities, and MUCH MORE. It is NOT a task manager replacement. Users should also be cautioned to NOT 'rank' their processes in importance to them. That is not how process priority classes are designed to operate. With Process Lasso you can just let its ProBalance algorithm do its job, temporarily lowering the priority class of select background processes in high loads -- OR you can tweak the system to your desire.
Just my two cents. I am NOT including a link as I do not want this to be considered spam. Also, I am the author, so am somewhat partial to it

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It is FREE for use indefinitely, though some advanced features get disabled over time, but NONE of the really popular ones like ProBalance, default priorities, and default affinities.