perf: hasOgImage filter uses memoized Set lookup; drop getCallbacks() per-page call

eleventy.config.js

@@ -404,15 +404,11 @@ export default function (eleventyConfig) {
   // Performance: skip PostHTML parsing for pages without <img> tags.
   // Both registered PostHTML plugins (remote-image-marker, eleventy-img) only
   // target <img> elements — no point parsing+serializing HTML without them.
-  // Overrides the default @11ty/eleventy/html-transformer transform (same name
+  // No URL transform callbacks are registered by any plugin, so the getCallbacks()
-  // overwrites via addTransform) with a pre-check that avoids the full PostHTML
+  // check is omitted — it costs ~1ms × 639 pages for a result that is always false.
-  // parse/serialize cycle (~3ms/page) for image-free pages.
   eleventyConfig.addTransform("@11ty/eleventy/html-transformer", async function(content) {
     if (typeof this.outputPath === "string" && this.outputPath.endsWith(".html") && !content.includes("<img")) {
-      // Safety: if URL transform callbacks exist (they modify <a>, <link>, etc.)
+      return content;
-      // we must still run the full pipeline even without images.
-      const hasUrlCallbacks = eleventyConfig.htmlTransformer.getCallbacks("html", this).length > 0;
-      if (!hasUrlCallbacks) return content;
     }
     return eleventyConfig.htmlTransformer.transformContent(this.outputPath, content, this);
   });
@@ -1018,9 +1014,10 @@ export default function (eleventyConfig) {
   });
 
   // Check if a generated OG image exists for this slug
+  // Delegates to the memoized hasOgImage() above (directory listed once per build → Set lookup)
   eleventyConfig.addFilter("hasOgImage", (slug) => {
     if (!slug) return false;
-    return existsSync(resolve(OG_CACHE_DIR, `${slug}.png`));
+    return hasOgImage(slug);
   });
 
   // Inline file contents (for critical CSS inlining)