It takes more than 100 seconds to download a text file of 200Kb

Application Performance
1

What is the name of the domain?

calendar.a4pro.net

What is the issue you’re encountering

I’m experiencing a strange performance issue with Cloudflare when proxying a specific endpoint.

What steps have you taken to resolve the issue?

Not sure how to resolve yet

What are the steps to reproduce the issue?

curl ‘https://calendar.a4pro.net/ticketbox?future_only=1&cityId=79&categories=music,theatersandart,others&exclude_organizers=GARDEN%20ART,DẾ%20GARDEN,Flower%201969’s,Lemlab%20Pottery%20Studio’
-H ‘accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.7’
-H ‘accept-language: en-US,en;q=0.9,vi;q=0.8’
-H ‘dnt: 1’
-H ‘priority: u=0, i’
-H ‘sec-ch-ua: “Chromium”;v=“136”, “Google Chrome”;v=“136”, “Not.A/Brand”;v=“99”’
-H ‘sec-ch-ua-mobile: ?0’
-H ‘sec-ch-ua-platform: “macOS”’
-H ‘sec-fetch-dest: document’
-H ‘sec-fetch-mode: navigate’
-H ‘sec-fetch-site: none’
-H ‘sec-fetch-user: ?1’
-H ‘upgrade-insecure-requests: 1’
-H ‘user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36’

2

First time post here, didn’t know I cannot edit my post after posting. Here’s the more detailed explantion:

  • The endpoint returns a text content which is an ICS calendar type
  • The file size is about 200Kb
  • It takes about more than 100 seconds to load that endpoint
  • I expect it to load fast, shoud be < 5 seconds
  • I tried disabling cache (Cloudflare, using page rules), but it doesn’t work
  • If downloading directly via public IP, it’s very fast (< 1 second)

Not sure what I did wrong here. Tried to ask ChatGPT but what it has told me are just workaround (like disabling cache, use DNS-only mode, etc).

3

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