Steam deck desktop mode download speed problem

[rlawnsvy87]

I bought Steam deck LCD 256gb model yesterday and now i figured out there is a problem with download applications and games in desktop mode. The problem is on firefox in desktop mode there's no problem watching youtube video and speed test in browser but when i download applications at discover or download GOG games through Heroic launcher then download speed 500 kbit/s in maximum so i searched and changed an energy setting in dev mode and download speed limit to 10000000, changed dns address to 8.8.8.8 in wifi setting but slow speed didn't change a bit in desktop mode. Please let me know how to solve this problem