EVO 850 performance getting slow with rapid enabled after some time. in Solid State Drives (SSD) Posted December 1, 2015 · Edited December 1, 2015 by Retko · Report reply Rapid extends into the memory footprint, hence the breakneck speeds, for a little while anyway. We haven't done any extensive long term testing, but I'd guess there's some sort of conflict over the Ram assignment going on and by turning if off and back on you're clearing the issue. If it were me I would probably disable rapid all together, I wouldn't ever see the benefit in day-to-day use. Hi, thanks for reply. First of, rapid mode gives mi speed around 1500Mb/s read. And I can really feel it. Second, without it, it is sluggish kinda, and it is around 270Mb/s. (Not 540Mb/s like samsung advertise). I just tested it again today. And fast speed lasted around 3 hours. Then it just went down. No restarts. (Rapid still enabled) I wanna know what can cause it.. Thanks you.