Hello,
Queue is enabled by default in order to prevent the over-consumption of your CPU, as you already have said. Each user uses PowerArchiver differently and even though it may not be always used to extract/compress many and large archives at a time, queue is enabled in case the need for that occurs and that the CPU does not get overloaded, affecting your other work.
Having queue enabled, does not affect your PA experience in anyway if you do not use it that way.
