Sluggishness can sometimes be attributed to the VRM throttling your CPU. While the CPU temp is perfectly fine, the VRMs are hitting a temp that forces them to throttle the CPU. Your CPU is then running at 1.4ghz on all cores, until the VRM temps lowers and hit an acceptable threshold.
You won't see this unless you are paying attention to your screen during a Prime95 test. If you are using IBT, the time column will tell you if throttling happen, because it will show that loop taking longer to complete.
Intel - "We will build bigger, and bigger moai until the gods favor us again." ~ Rapa-Nui (1994)
AMD - "Two roads diverged in a wood and I - I took the one less traveled by, and that has made all the difference." ~ Robert Frost