CDNs can slow your site down

CDNs can slow your site down

Content delivery networks promise faster load times, but misconfigured cache rules can make your site slower instead.

Your site feels slow. You add a CDN, expecting instant speed gains. Two weeks later, your Time to First Byte is worse than before, your server logs show doubled requests, and you’re debugging cache headers at 11 p.m. on a Tuesday.

CDNs work—when configured correctly. But most newsletter operators flip the switch, watch the dashboard turn green, and never check whether pages actually load faster. Origin-pull overhead, broken cache rules, and edge-server misconfigurations can turn a performance boost into a performance penalty.

Tomorrow’s premium edition walks through the five most common CDN misconfigurations that slow sites down, the headers you need to verify before trusting your provider’s dashboard, and when a simpler caching plugin delivers better results than a global edge network.

You’ll see real Time to First Byte data from operators who removed their CDN and watched load times drop, the cache-control headers that break dynamic content, and the specific origin-pull patterns that double your server’s workload instead of reducing it.

Read the full edition

Tomorrow’s premium edition breaks down the five CDN misconfigurations that slow your site, the cache headers to verify before you trust the dashboard, and when a simple plugin beats a global edge network.

Keep your stack fast and your coffee hot,
The One Two Three Send Team

PS: Tomorrow’s edition includes the exact headers to check before you assume your CDN is helping.