: Does servicing an API from a subdomain make your app slower? I have a single-page application (SPA) located in application.com, and I want to serve the API from api.application.com. Since this

@Nimeshi995

Since your OPTIONS response doesn't actually rely on the same application logic your application does I wouldn't expect it to be twice as slow. If your OPTIONS response does not include an entity-body (only a header response, similar to HEAD) then the data transfer will be quite small and much quicker. But you will still have the latency between your visitor/user and your application server.

Also, I would go with a DNS A record for your sub domain, if not already. If you use a CNAME record it will require an additional DNS lookup to get the IP address for what the CNAME entry is pointed at.

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