I reported the same (or similar) behaviour some days ago.
I dont know where this comes from, but as the files are cached by Cloudflare, this can not be related to my Server. Everything after the server should be CloudFlares “problem” and the at least should investigate where these comes from, as just saying “its your ISPs” fault is very very cheap…
I atm also suffer from this. 2kb takes 500ms to download, TTFB is very bad also. But as I said it depends very hard from every minute to minute.
In germany we have just 3-4 ISP, so at least 30% of german users are actually atm getting fuucking bad Cloudflare experiance and performance.
Thats sad.
BTW: my normal TTFB is about 30ms. And I always had about 30ms with Cloudflare, untill some days when I reported this. This issue is still now here. Sometimes it is, sometimes not…