If your new post takes minutes (or longer) to show up in your RSS feed, or an auto-posting tool seems slow to pick up fresh content, caching is usually the culprit — not a broken feed, not a slow auto-posting tool, but one or more layers between your CMS and the tool reading your feed holding onto a stale copy.
An RSS feed passes through several potential caching points before an auto-posting tool ever sees it: a caching plugin on your CMS (common on WordPress, where plugins like WP Super Cache or W3 Total Cache can cache the feed XML output just like any other page), a CDN sitting in front of your site (Cloudflare and similar services cache by default unless configured otherwise), and the auto-posting tool’s own polling interval, which checks your feed on a schedule rather than instantly on every change. Delay can come from any one of these, or a combination.
The fastest diagnostic is fetching your raw feed URL directly (with curl, or simply opening it in a browser) immediately after publishing a new post: if the new item appears there right away, your CMS and caching layer are fine and the delay is in the auto-posting tool’s polling interval. If the new item is missing from the raw feed itself for several minutes, the delay is upstream — a caching plugin or CDN serving a stale copy of the feed XML rather than regenerating it on each publish.
Most WordPress caching plugins let you exclude specific URL patterns from caching, and the feed URL (typically ending in /feed/) is a common, well-supported exclusion in nearly every major caching plugin’s settings. Setting the feed to bypass cache entirely, or to a very short cache lifetime (a minute or two rather than hours), resolves this layer without meaningfully increasing server load, since feed requests are infrequent compared to full page loads.
A CDN like Cloudflare applies its own caching rules on top of whatever your CMS does, and by default may cache the feed URL for longer than you’d want. Most CDNs support a page rule or cache rule specifically for a URL pattern like /feed/*, letting you set a short TTL or bypass caching entirely for that path while leaving the rest of your site’s caching untouched.
Even with zero caching anywhere in the chain, an auto-posting tool still checks your feed on its own schedule rather than getting instantly notified the moment you hit publish — this is inherent to how RSS-based automation works, covered in more depth in our RSS vs. webhooks vs. API polling guide. A short, frequent polling interval minimizes this gap, but it’s a different, unavoidable source of delay than caching, and not something caching fixes.
Publish a new post, then immediately fetch your raw feed URL (curl or a browser). If the new item is missing for several minutes, a caching layer between your CMS and the public feed URL is serving a stale copy.
Excluding the feed URL from caching, or setting a very short cache lifetime, is standard practice and low-risk — feed requests are infrequent enough that the server load difference is negligible, and the freshness benefit for auto-posting is real.
No — caching is a stale copy of your feed being served instead of the current one; polling interval is simply how often the auto-posting tool checks the (correctly current) feed. Both can cause delay, but they’re fixed differently.
Delayed auto-posts are almost always a caching issue somewhere between your CMS and the public feed URL, not a problem with the auto-posting tool itself. Checking the raw feed directly after publishing isolates which layer is stale, and excluding the feed URL from CMS and CDN caching resolves the vast majority of cases.
