'Add the CDN, your origin speed stops mattering' — wrong layer

'Add the CDN, your origin speed stops mattering' — wrong layer
Heard this week from a performance post-mortem: a store bolted on a CDN and still bled at checkout. Word is the cacheable pages flew while the dynamic ones — cart, account, search — went straight to a starved origin. A source consulting for two managed hosts says CDN upsells let providers undersize the origin container and point to edge hit-rates when you complain. The advice to 'just cache it' ignores that your money pages are uncacheable by design.
Watch this: when a host leads with edge stats and buries origin CPU limits, read the limits first.