Why Upload rate in Xbox is really bad even though it´s quite good in desktop speedy test?

You might check your router for things like media prioritization. I had that set on on my linksys and had all kinds of xbox issues. After turning it off it fixed things. Also I'm not sure if your router and modem are separate but you might see if you
can directly go through the modem and see if that changes anything (just as a test, of course).

That could be cause to many things. connection strength, Ethernet VS WiFi, what you have near your console (appliances or anything blocking it from your router) if using WiFi. What may help you is if you are not hooked into Ethernet (wired internet) is
to switch to that over WiFi. If that's not the case this article may help you https://www.windowscentral.com/xbox-one-networking-guide

UPDATE: Microsoft support called me last week to troubleshooting the reported issue. However, they insist the problem is on the Pro Evolution Soccer game side even if I explained to them that the detailed networking statics option in settings is showing
the upload rate is really poor. It is really frustrating when you expect a high level customer service from a tech-giant and they don´t care about THEIR issue. So I´m still trying to play with 3MBps upload with 250Mbps download and trying to do my best to
win the competitors in this game which demands a very good connection.

Any helping on this thread would be appreciate.

Best Regards,

Michel Khouri

This is the story behind your problem, i think

Hey there
MichelKhouri,

Thanks for reaching out to the Community for assistance on this speed matter.

I can totally understand how having a slow speed only on your console could be disheartening. Some advice I would suggest in hopes of improving your speed would be to try the steps outlined in our

Slow Performance Solution and/or
Troubleshoot slow game or app downloads on Xbox One article online.

When you get the chance, give those steps a shot and let us know if that had a positive affect of any kind on your speed.

Hope this was helpful.

Thanks for reading!