Recently I upgraded some Ethernet from the PC>Router and started doing some Speed Tests with Ookla & Others. Two months ago my ISP "gifted" us a Speed Increase from 200>500Mbps. Not expecting to see any differences with the new CAT 7 Cables, the first Test came in a 550Mbps... Great.. And then I started Testing again after each test cycle, as the numbers looked lower at the onset. Sure enough the Speed would start off at 500+, then I would watch the Speed rapidly decrease during that 15 Seconds of the Download portion of the Test.. no consistency in numbers but it could go as low as 77 or less. I threw on other Cables with no change. I changed Ports and everything else I could think of. I then bypassed the Router connecting the PC directly to the Modem... and I was surprised to see Solid 525Mbps Speeds. To eliminate any other factors, I called my ISP and they changed the Modem due to its age (2 years) and the tech was kind enough to Test every link in the chain with his Analyzer and could find no issues. As everything now pointed to the 2600, I logged a Ticket with Synology and after phone calls and e-mails asking me to change various settings, and after a few days of tests the next to last was "Turn OFF Threat prevention".... Once that occurred, the Speed issue was resolved. The culprit (maybe?) is my USB Flash Drive. For the 1.5 years owning this, I had always had a Class 3 95 Write Speed SD Card installed (borrowed from my camera) and saw no issues. Recently I saw a post about the "Best" Flash Drive and it recommended the Kingston DataTraveler Kyson 32GB High Performance USB 3.2 Metal Flash Drive... I ordered and installed it, again with no issues to my knowledge. Synology Logs showed they were only seeing (7.355 MB/s vs a recommended 15MB/s)... The Kingston claimed 60Mbps Write. I called Kingston and a great rep did some digging and found that ONLY the 64 & 128Mbps have the 60Mbps claimed Speed... NOT the 32. So much for the Specs found on Amazon. Kingston is sending me a higher revision Number Model to test. And the "Recommended" Flash Drives on the Synology Site? Most of them are obsolete and/or unavailable. If you are running Threat Prevention, Have you done repeated, successive Speed Download Tests? Do yours Degrade when doing these repeated Tests?? And what specific USB Flash Drive are you using?