Slow loading speed for static files

We are running an azure website on a S2 hostingplan and have a bundled and minified javascript file that is 1.6MB large. The load times of this file are sometimes 600ms and other times it suddenly jumps up to 4 seconds or even higher.
To improve the loading times we tried creating an azure cdn endpoint that loads the files from the azure websites and now we sometimes see loading times of around 200ms. But sometimes it still jumps up to 4 seconds or higher.
Can anyone give me an idea what is going on, I assume the larger loading times are due to disk access and figured that adding an cdn would fix this problem but as it turns out it didn't.
What is going on here?

To isolate and help us investigate, can you try the following:
create a dummy site in the same web hosting plan as the site at stake. e.g. give it some random test name.
Drop that javascript file in the wwwroot folder of that site
Do you see the same slowness? If so, can you share the name of this dummy site to help us investigate?

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