# First Byte Time vs CDN?

**URL:** <https://meta.discourse.org/t/first-byte-time-vs-cdn/141899>\
**Category:** Development\
**Created:** [February 18, 2020, 2:14pm UTC](https://meta.discourse.org/t/first-byte-time-vs-cdn/141899 "2020-02-18T14:14:33Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![eextra](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/eextra/32/170266_2.png) [@eextra](https://meta.discourse.org/u/eextra)\
**Post date:** [February 18, 2020, 8:11pm UTC](https://meta.discourse.org/t/first-byte-time-vs-cdn/141899/5 "2020-02-18T20:11:43Z")

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But are we talking about a situation once we add the cdn address to our app.yml file or not ?

And what is the reason to use a subdomain for cdn addres? i.e. why can’t it be DISCOURSE\_CDN\_URL: [//637763234.cdn-provider.com](https://637763234.cdn-provider.com) and should be [discourse-cdn.example.com](http://discourse-cdn.example.com) ??

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