@Joseph-TP this is a sudden change. And nothing has changed anywhere. I used latest driver from tp link website as well. I tried the same usb in different windows machine, there also same problem...

Not op, but same problem . Did everything. The link speed shows 290 mbps, and upload speed is also 100 mbps. But download speed is capped to 25 mbps!

I am getting 20 mbps speed maximum. I tried multiple combinations like 1. Changed usb 2. Used other adapter to connect to same access point - got 100 mbps download speed 3. Changed operating system...