[HELP] USB 3 ports slow - how to test & troubleshoot?

Anyone else run into an issue where USB 3 ports are suddenly sluggish?

Or know how I can troubleshoot to test to see what their throughput is? I've searched here but haven't found anything specifically related.

Mojave 10.14.2 CPU.....Intel - Core i7-8700K 3.7 GHz 6-Core Processor Cooler.....Noctua - NH-D15 82.5 CFM CPU Cooler MoBo.....Asus - ROG MAXIMUS X HERO (WI-FI AC) ATX LGA1151 Motherboard RAM.....G.Skill - TridentZ RGB Series 16 GB (2 x 8 GB) DDR4-4000 Memory HD.....Samsung - 970 Evo 1 TB M.2-2280 Solid State Drive Video Card.....Sapphire - Radeon RX 580 8 GB PULSE Video Card Case.....NZXT - H500i (Black/Blue) ATX Mid Tower Case Power Supply.....EVGA - SuperNOVA G3 650 W 80+ Gold Certified Fully-Modular ATX Power Supply 

submitted by /u/deuteranope
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