Increase slide-show subscription limit to 10000 and improve image loading

www/css/client.css

@@ -364,18 +364,22 @@ a.nostr-embed-preview-text:hover {
 }
 
 #divBody {
-  position: relative;
+  position: fixed;
   top: max(var(--header-height), var(--header-min-height));
+  bottom: max(var(--footer-height), var(--footer-min-height));
+  left: 0;
+  right: 0;
   background-color: var(--background-color);
   display: flex;
   flex-direction: row;
   flex-wrap: wrap;
   justify-content: space-around;
   align-content: space-around;
-  width: 100%;
+  width: auto;
-  height: 90%;
   padding: 20px;
   overflow-y: auto;
+  box-sizing: border-box;
+  z-index: 0;
 }
 
 #divFooter {

www/js/post-interactions.mjs

@@ -743,18 +743,20 @@ function appendTaggedMedia(contentEl, eventData) {
     if (!media.video.length) return;
 
     const existingVideoSrcs = new Set(
-        Array.from(contentEl.querySelectorAll('video')).map((el) => el.getAttribute('src')).filter(Boolean)
+        Array.from(contentEl.querySelectorAll('video')).map((el) => el.getAttribute('src') || el.getAttribute('data-src')).filter(Boolean)
     );
 
     media.video.forEach((url) => {
         if (existingVideoSrcs.has(url)) return;
         const videoEl = document.createElement('video');
         videoEl.className = 'post-video-embed';
-        videoEl.src = url;
         videoEl.controls = true;
         videoEl.playsInline = true;
-        videoEl.preload = 'metadata';
+        videoEl.preload = 'none';
+        videoEl.setAttribute('data-src', url);
         contentEl.appendChild(videoEl);
+        /* The global IntersectionObserver in utilities.mjs will promote
+         * data-src to src when this video scrolls into view. */
     });
 }
 
@@ -768,13 +770,25 @@ function applyVideoPlaybackPreferences(contentEl, autoplayVideo = false) {
         videoEl.controls = true;
         videoEl.playsInline = true;
         videoEl.setAttribute('playsinline', '');
-        videoEl.preload = 'metadata';
+
+        /* Keep preload='none' for lazy-loaded videos (data-src not yet
+         * promoted to src). Once src is set, allow metadata preload. */
+        if (videoEl.getAttribute('data-src') && !videoEl.src) {
+            videoEl.preload = 'none';
+        } else {
+            videoEl.preload = 'metadata';
+        }
 
         if (autoplayVideo) {
             videoEl.autoplay = true;
             videoEl.muted = true;
             videoEl.setAttribute('autoplay', '');
             videoEl.setAttribute('muted', '');
+            /* If lazy-loaded and not yet visible, force-load now for autoplay. */
+            const dataSrc = videoEl.getAttribute('data-src');
+            if (dataSrc && !videoEl.src) {
+                videoEl.src = dataSrc;
+            }
             const playPromise = videoEl.play?.();
             if (playPromise?.catch) playPromise.catch(() => {});
         } else {

www/js/utilities.mjs

@@ -27,6 +27,69 @@ export const objMimeTypes = {
 
 export const arrImageExt = [".apng", ".avif", ".gif", ".jpg", ".jpeg", ".jfif", ".pjpeg", ".pjp", ".png", ".svg", ".webp"];
 
+/* ── Global lazy-load for <video data-src="..."> elements ──────────────
+ * WebKitGTK spins up a full GStreamer pipeline (~20+ threads) per <video>
+ * as soon as `src` is set, even with preload='metadata'. A feed with 11
+ * videos creates 250+ threads in a single WebKitWebProcess. To avoid this,
+ * videos are created with `data-src` instead of `src`. This global
+ * IntersectionObserver + MutationObserver promotes `data-src` to `src`
+ * only when the video scrolls near the viewport. */
+const _lazyVideoIO = (typeof IntersectionObserver !== 'undefined')
+    ? new IntersectionObserver(
+        (entries, obs) => {
+            entries.forEach((entry) => {
+                if (!entry.isIntersecting) return;
+                const el = entry.target;
+                const url = el.getAttribute('data-src');
+                if (url && !el.src) {
+                    el.preload = 'metadata';
+                    el.src = url;
+                }
+                obs.unobserve(el);
+            });
+        },
+        { rootMargin: '300px', threshold: 0 }
+    )
+    : null;
+
+if (typeof document !== 'undefined' && _lazyVideoIO) {
+    /* Observe existing videos with data-src */
+    document.querySelectorAll('video[data-src]').forEach((v) => _lazyVideoIO.observe(v));
+
+    /* Watch for new videos added to the DOM */
+    const _lazyVideoMO = new MutationObserver((mutations) => {
+        mutations.forEach((mutation) => {
+            mutation.addedNodes.forEach((node) => {
+                if (node.nodeType !== 1) return;
+                const videos = (node.tagName === 'VIDEO')
+                    ? [node]
+                    : (node.querySelectorAll ? Array.from(node.querySelectorAll('video[data-src]')) : []);
+                videos.forEach((v) => {
+                    if (v.hasAttribute('data-src') && !v.src) {
+                        /* Delay observation until after layout to avoid
+                         * false-positive intersection at (0,0). */
+                        requestAnimationFrame(() => {
+                            requestAnimationFrame(() => {
+                                if (v.hasAttribute('data-src') && !v.src) {
+                                    _lazyVideoIO.observe(v);
+                                }
+                            });
+                        });
+                    }
+                });
+            });
+        });
+    });
+    if (document.body) {
+        _lazyVideoMO.observe(document.body, { childList: true, subtree: true });
+    } else {
+        document.addEventListener('DOMContentLoaded', () => {
+            _lazyVideoMO.observe(document.body, { childList: true, subtree: true });
+            document.querySelectorAll('video[data-src]').forEach((v) => _lazyVideoIO.observe(v));
+        });
+    }
+}
+
 export const htmlCenteringWrapper = `<!DOCTYPE html>
   <html lang="en" dir="ltr">
   <head>
@@ -645,9 +708,13 @@ export const htmlFormatText = (txt) => {
             if (rgxImg.test(EachLink)) {
                 chunk = chunk.replace(EachLink, `<img src="${EachLink}">`);
             } else if (isVideoUrl(EachLink)) {
+                /* Lazy-load: use data-src instead of src to prevent WebKitGTK
+                 * from spinning up GStreamer pipelines for off-screen videos.
+                 * The global IntersectionObserver in utilities.mjs promotes
+                 * data-src to src when the video scrolls into view. */
                 chunk = chunk.replace(
                     EachLink,
-                    `<video class="post-video-embed" src="${EachLink}" controls playsinline preload="metadata"></video>`
+                    `<video class="post-video-embed" data-src="${EachLink}" controls playsinline preload="none"></video>`
                 );
             } else {
                 chunk = chunk.replace(EachLink, `<a href="${EachLink}" target="_blank" rel="noopener noreferrer">${EachLink}</a>`);

www/js/version.json

@@ -1,5 +1,5 @@
 {
-  "VERSION": "v0.7.103",
+  "VERSION": "v0.7.104",
-  "VERSION_NUMBER": "0.7.103",
+  "VERSION_NUMBER": "0.7.104",
-  "BUILD_DATE": "2026-08-08T11:27:48.503Z"
+  "BUILD_DATE": "2026-08-17T10:13:32.771Z"
 }

www/slide-show.html

@@ -393,9 +393,7 @@ const versionInfo = await getVersion();
 
     const SLIDESHOW_SECONDS_STORAGE_KEY = 'slideShowSeconds';
     const SLIDESHOW_MODE_STORAGE_KEY = 'slideShowMode';
-    const INITIAL_VISIBLE_IMAGE_COUNT = 200;
+    let visibleImageCount = 200; // updated to screen-fit estimate at load time
-    const MORE_IMAGES_CHUNK = 200;
-    let visibleImageCount = INITIAL_VISIBLE_IMAGE_COUNT;
 
     const PUBLIC_READ_RELAYS = [
       'wss://relay.damus.io',
@@ -668,6 +666,67 @@ const versionInfo = await getVersion();
       return Math.max(1, Math.floor(width / minTileWidth));
     }
 
+    // Estimated width/height ratio of a typical image tile. 1.0 (square)
+    // is a reasonable middle-ground for photos, screenshots and memes.
+    const ESTIMATED_IMAGE_ASPECT_RATIO = 1.0;
+    // Show more than the strict fit so the masonry grid still looks full
+    // once real (varying) image heights are loaded.
+    const SCREEN_FILL_BUFFER = 2.5;
+
+    function estimateVisibleImageCount() {
+      const viewportWidth = window.innerWidth || 1024;
+      const viewportHeight = window.innerHeight || 768;
+
+      let headerHeight = 60;
+      let footerHeight = 20;
+      try {
+        const rootStyle = getComputedStyle(document.documentElement);
+        headerHeight = Math.max(
+          parseFloat(rootStyle.getPropertyValue('--header-min-height')) || 60,
+          parseFloat(rootStyle.getPropertyValue('--header-height')) || 0
+        );
+        footerHeight = Math.max(
+          parseFloat(rootStyle.getPropertyValue('--footer-min-height')) || 20,
+          parseFloat(rootStyle.getPropertyValue('--footer-height')) || 0
+        );
+      } catch (_error) {
+        // keep default header/footer estimates
+      }
+
+      const availableHeight = Math.max(200, viewportHeight - headerHeight - footerHeight);
+      const columnCount = getSlideColumnCount();
+      const gridWidth = divSlideGrid?.clientWidth || viewportWidth;
+      const tileWidth = Math.max(80, gridWidth / columnCount);
+      const tileHeight = tileWidth / ESTIMATED_IMAGE_ASPECT_RATIO + 12; // include gap/margin
+      const rowsThatFit = Math.max(1, Math.floor(availableHeight / tileHeight));
+      const estimatedCount = Math.ceil(columnCount * rowsThatFit * SCREEN_FILL_BUFFER);
+      return Math.max(columnCount, estimatedCount);
+    }
+
+    function createTileElements(posts, startIndex, endIndex, totalVisible) {
+      const columnCount = getSlideColumnCount();
+      const tiles = [];
+      for (let i = startIndex; i < endIndex; i += 1) {
+        const post = posts[i];
+        const tile = document.createElement('button');
+        tile.className = 'slideTile';
+        tile.type = 'button';
+        tile.dataset.index = String(i);
+        tile.title = `Open image ${i + 1} of ${totalVisible}`;
+
+        const img = document.createElement('img');
+        img.src = post.imageUrl;
+        img.alt = 'Post image';
+        img.loading = 'lazy';
+
+        tile.appendChild(img);
+        tile.addEventListener('click', () => openLightbox(i));
+
+        tiles.push({ tile, columnIndex: i % columnCount });
+      }
+      return tiles;
+    }
+
     function renderGrid() {
       divSlideGrid.innerHTML = '';
       if (imagePosts.length === 0) {
@@ -678,8 +737,6 @@ const versionInfo = await getVersion();
 
       divSlideEmpty.style.display = 'none';
 
-      const visiblePosts = getVisibleImagePosts();
-      const visibleTotal = visiblePosts.length;
       const columnCount = getSlideColumnCount();
       const columns = [];
       for (let i = 0; i < columnCount; i += 1) {
@@ -689,25 +746,41 @@ const versionInfo = await getVersion();
         divSlideGrid.appendChild(col);
       }
 
-      // Row-major visual ordering:
+      const visiblePosts = getVisibleImagePosts();
-      // 0->col0, 1->col1, ... n->col(n%columnCount)
+      const visibleTotal = visiblePosts.length;
-      visiblePosts.forEach((post, index) => {
+      const tileEntries = createTileElements(visiblePosts, 0, visibleTotal, visibleTotal);
-        const tile = document.createElement('button');
+      tileEntries.forEach(({ tile, columnIndex }) => {
-        tile.className = 'slideTile';
+        columns[columnIndex].appendChild(tile);
-        tile.type = 'button';
+      });
-        tile.dataset.index = String(index);
-        tile.title = `Open image ${index + 1} of ${visibleTotal}`;
 
-        const img = document.createElement('img');
+      updateMoreButton();
-        img.src = post.imageUrl;
+    }
-        img.alt = 'Post image';
-        img.loading = 'lazy';
 
-        tile.appendChild(img);
+    function appendMoreTiles() {
-        tile.addEventListener('click', () => openLightbox(index));
+      if (imagePosts.length === 0) return;
+      divSlideEmpty.style.display = 'none';
 
-        const targetColumn = columns[index % columnCount];
+      const existingColumns = divSlideGrid.querySelectorAll('.slideColumn');
-        targetColumn.appendChild(tile);
+      if (existingColumns.length === 0) {
+        renderGrid();
+        return;
+      }
+
+      // Count how many tiles already exist across all columns
+      let existingTileCount = 0;
+      existingColumns.forEach((col) => { existingTileCount += col.children.length; });
+
+      const visiblePosts = getVisibleImagePosts();
+      const newTotal = visiblePosts.length;
+
+      if (existingTileCount >= newTotal) {
+        updateMoreButton();
+        return;
+      }
+
+      const tileEntries = createTileElements(visiblePosts, existingTileCount, newTotal, newTotal);
+      tileEntries.forEach(({ tile, columnIndex }) => {
+        existingColumns[columnIndex].appendChild(tile);
       });
 
       updateMoreButton();
@@ -878,8 +951,14 @@ const versionInfo = await getVersion();
       }
     }
 
+    function isReplyEvent(evt) {
+      if (!evt?.tags || !Array.isArray(evt.tags)) return false;
+      return evt.tags.some(tag => Array.isArray(tag) && tag[0] === 'e');
+    }
+
     function upsertNoteIfImage(evt) {
       if (!evt?.id || evt.kind !== 1 || evt.pubkey !== targetPubkey) return false;
+      if (isReplyEvent(evt)) return false;
       const imageUrl = extractFirstDirectImageUrl(evt.content);
       if (!imageUrl) return false;
 
@@ -905,6 +984,9 @@ const versionInfo = await getVersion();
         initialLoadTimer = null;
       }
       setLoadingState(false);
+      // Estimate how many tiles the viewport can hold so we fill the screen
+      // without loading more than needed.
+      visibleImageCount = estimateVisibleImageCount();
       renderGrid();
     }
 
@@ -928,7 +1010,7 @@ const versionInfo = await getVersion();
         {
           kinds: [1],
           authors: [targetPubkey],
-          limit: 2000
+          limit: 10000
         },
         {
           closeOnEose: false,
@@ -952,7 +1034,7 @@ const versionInfo = await getVersion();
       publicPool = new window.NostrTools.SimplePool();
       publicSub = publicPool.subscribeMany(
         PUBLIC_READ_RELAYS,
-        [{ kinds: [1], authors: [targetPubkey], limit: 2000 }],
+        [{ kinds: [1], authors: [targetPubkey], limit: 10000 }],
         {
           onevent: (evt) => {
             const changed = upsertNoteIfImage(evt);
@@ -1077,8 +1159,8 @@ const versionInfo = await getVersion();
 
         if (btnSlideMore) {
           btnSlideMore.addEventListener('click', () => {
-            visibleImageCount += MORE_IMAGES_CHUNK;
+            visibleImageCount += estimateVisibleImageCount();
-            renderGrid();
+            appendMoreTiles();
           });
         }