In regards to slow upload or download there are a miriad of factors that can cause this. First the forum atm is working fine but some individuals it's not.
You can generally fix a slow internet connection if the issue is on your end. A simple restart of your modem and your router (or all-in-one wireless gateway) can sometimes speed up your connection. But your slow speeds may also be the result of problems on your provider’s end—problems you just can’t fix.
Generally, your modem or router (or both) will create a speed bottleneck if not working properly—the same goes with wireless gateways. If your equipment is too old, it may not support important internet protocols. Equipment damage, such as bad ports or components, can also cause slowdowns.
Like the IT crowd says...Have you tried turning it off and off again.
This applies to your mobile ohone as well. A phone capable of using 5g is better if in a receiving area. Since I changed to a new phone/5g my deadspots are no longer. Talk to you provider about deadspots and your modem.phone speeds.
Lastly make sure your phone and software are fully updated (backup before doing, I have a 500gig usb that I backup to or cloud.)
Using a different browser can be helpful. Chrome seems to be the best.
Let us know if problems still exist.