Separated and improved request throttling.

src/methods/redditAlbum.js

@@ -17,9 +17,15 @@ function normalizeType(type) {
 }
 
 async function redditAlbum(host, post, { reddit }) {
-    // fetched through the authenticated/throttled client, not a raw fetch()/bhttp request -
-    // reddit's anonymous-traffic bot challenge blocks plain unauthenticated .json requests
-    const data = await reddit.getSubmission(post.id);
+    // reddit's submission listing already embeds media_metadata/gallery_data for gallery posts,
+    // and curate/posts.js carries them through as post.mediaMetadata/post.galleryData - reuse
+    // those instead of re-fetching the same post individually through reddit's own client
+    // (reservoir: 6/min, maxConcurrent: 1 - see src/reddit/client.js), which would otherwise cost
+    // one full throttled round trip per gallery post. Only fall back to a fresh fetch if the
+    // listing didn't have it for some reason (e.g. gallery_data null on the listing too).
+    const data = post.mediaMetadata
+        ? { media_metadata: post.mediaMetadata, gallery_data: post.galleryData }
+        : await reddit.getSubmission(post.id);
     const mediaMetadata = data.media_metadata || {};
 
     // gallery_data (the ordered {media_id, is_deleted, ...} list for this gallery) has been