We’ll need a bit more information to go on than that. What speeds are you getting, and what would you expect? Where are you located, and on which ISP?
What sort of speeds do you get from these two commands?
wget 'https://api.snapcraft.io/api/v1/snaps/download/99T7MUlRhtI3U0QFgl5mXXESAiSwt776_9066.snap?cdn=canonical-lcy01&testing=1'
wget 'https://api.snapcraft.io/api/v1/snaps/download/99T7MUlRhtI3U0QFgl5mXXESAiSwt776_9066.snap?cdn=canonical-bos01&testing=1'