Hello @linh trinh
What about the connection quality of other software? Only remote desktop slow?
Did this happened right after resetting the router? Is there any other changes, like updates?
The router has the function to restrict someone’s internet usage. You will need login password (not wifi password) to sign in to your router page. From there, you can find out if your device has been limited.
You can also change the connection speed to see whether the issue persist?
Hope this helps!
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Best Regards
Karlie