same problem here (Germany). Very slow download speed, cross browser and also if I try to download via various download mangers. I can confirm this issue occurred several times during the last months. If you are sure this is not caused by your servers I guess it's some sort of network node in Germany.
UPDATE: After a short research it seems to be a Telekom (German internet provider) related routing problem. Issues with very slow download connections to s3.amazon are reported several times in their community. Some users say using a VPN could help. I will test this and post an update here
UPDATE 2: USE A VPN!! Even the free VPN build into Opera speeds up the download time drastically:
The following speed results were measured on 14.01.2021 at 18:45:
Internet Provider: Telekom (50 Mbit/s max. download VDSL)
~ 5 - 30 KB/s without any VPN (Chrome)
~ 400-600 KB/s with Opera VPN (Opera)
~ 6-8 MB/s while connected to my University data center via VPN (Chrome) The limiting factor here is the max. downloadspeed offered by my internet provider.