Specs seem good, but not all laptops handle real time audio processing the same. Best bet is to increase latency in addition to all the other things you are doing already. External hard drive will not help with the issue. A faster hard drive will help with song load up times, and in some instances browsing and sorting songs on the fly. An external hard drive connection in most cases will be a lot slower then your internal one (most people are forced to use USB)
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