Request priority with map website


we have a website which provides map content (map tiles). The content of tiles is image/tiff. There is huge amount of requests when map content is rendered with slower latency.
Beside, there are some API requests (application/json content) related to user interaction, which are blocked when map tiles are being loaded.
Is there any way to prioritize API requests before map tiles requests?
I tried to set response header cf-priority (suggested by [blog](, which would solve this issue, however, we don’t have Pro package yet. Is Pro required for using cf-priority header?

Thanks for any help.


It would be required that you are on the Pro plan.

Thank you.