Pages returns static assets incredibly slowly

For Workes & Pages, what is the name of the domain?

app.desana.io

What is the issue or error you’re encountering

When loading our website, the static assets take such a long time to actually download, despite them being simple javascript files. This only seems to occur in certain geographies, but this can be consistently reproduced in Hamburg.

Some of the loads are taking up to 1.5 minutes to load, and then just failing, but most loads take around 20 seconds, which is obviously a horrific experience.