perf: split into fast poll + slow-cached library fetches

Fast poll (every cycle): SABnzbd, Sonarr/Radarr queue + history,
qBittorrent — all lightweight with no include* params.

Slow cache (5 min TTL): Sonarr series, Radarr movies, tags —
fetched only when cache expires. These rarely change.

This eliminates the 2s+ includeSeries/includeMovie joins from
every poll cycle. First poll is still slow (cold cache), but
subsequent polls should complete in <500ms.

server/utils/poller.js

@@ -15,6 +15,7 @@ const POLLING_ENABLED = POLL_INTERVAL > 0;
 
 let polling = false;
 let lastPollTimings = null;
+const SLOW_CACHE_TTL = 5 * 60 * 1000; // 5 minutes for series/movie library
 
 // Timed fetch helper: runs a fetch and records how long it took
 async function timed(label, fn) {
@@ -36,8 +37,59 @@ async function pollAllServices() {
     const sonarrInstances = getSonarrInstances();
     const radarrInstances = getRadarrInstances();
 
-    // All fetches in parallel, each individually timed
-    const results = await Promise.all([
+    // Slow-changing data: series/movie libraries + tags (only fetch when cache expired)
+    const slowTasks = [];
+    if (!cache.get('poll:sonarr-series')) {
+      slowTasks.push(
+        timed('Sonarr Series', () => Promise.all(sonarrInstances.map(inst =>
+          axios.get(`${inst.url}/api/v3/series`, {
+            headers: { 'X-Api-Key': inst.apiKey }
+          }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
+            console.error(`[Poller] Sonarr ${inst.id} series error:`, err.message);
+            return { instance: inst.id, data: [] };
+          })
+        )))
+      );
+    }
+    if (!cache.get('poll:radarr-movies')) {
+      slowTasks.push(
+        timed('Radarr Movies', () => Promise.all(radarrInstances.map(inst =>
+          axios.get(`${inst.url}/api/v3/movie`, {
+            headers: { 'X-Api-Key': inst.apiKey }
+          }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
+            console.error(`[Poller] Radarr ${inst.id} movies error:`, err.message);
+            return { instance: inst.id, data: [] };
+          })
+        )))
+      );
+    }
+    if (!cache.get('poll:sonarr-tags')) {
+      slowTasks.push(
+        timed('Sonarr Tags', () => Promise.all(sonarrInstances.map(inst =>
+          axios.get(`${inst.url}/api/v3/tag`, {
+            headers: { 'X-Api-Key': inst.apiKey }
+          }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
+            console.error(`[Poller] Sonarr ${inst.id} tags error:`, err.message);
+            return { instance: inst.id, data: [] };
+          })
+        )))
+      );
+    }
+    if (!cache.get('poll:radarr-tags')) {
+      slowTasks.push(
+        timed('Radarr Tags', () => Promise.all(radarrInstances.map(inst =>
+          axios.get(`${inst.url}/api/v3/tag`, {
+            headers: { 'X-Api-Key': inst.apiKey }
+          }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
+            console.error(`[Poller] Radarr ${inst.id} tags error:`, err.message);
+            return { instance: inst.id, data: [] };
+          })
+        )))
+      );
+    }
+
+    // Fast-changing data: queues, history, torrents (every poll)
+    const fastTasks = [
       timed('SABnzbd Queue', () => Promise.all(sabInstances.map(inst =>
         axios.get(`${inst.url}/api`, {
           params: { mode: 'queue', apikey: inst.apiKey, output: 'json' }
@@ -54,18 +106,9 @@ async function pollAllServices() {
           return { instance: inst.id, data: { history: { slots: [] } } };
         })
       ))),
-      timed('Sonarr Tags', () => Promise.all(sonarrInstances.map(inst =>
-        axios.get(`${inst.url}/api/v3/tag`, {
-          headers: { 'X-Api-Key': inst.apiKey }
-        }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
-          console.error(`[Poller] Sonarr ${inst.id} tags error:`, err.message);
-          return { instance: inst.id, data: [] };
-        })
-      ))),
       timed('Sonarr Queue', () => Promise.all(sonarrInstances.map(inst =>
         axios.get(`${inst.url}/api/v3/queue`, {
-          headers: { 'X-Api-Key': inst.apiKey },
-          params: { includeSeries: true }
+          headers: { 'X-Api-Key': inst.apiKey }
         }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
           console.error(`[Poller] Sonarr ${inst.id} queue error:`, err.message);
           return { instance: inst.id, data: { records: [] } };
@@ -82,8 +125,7 @@ async function pollAllServices() {
       ))),
       timed('Radarr Queue', () => Promise.all(radarrInstances.map(inst =>
         axios.get(`${inst.url}/api/v3/queue`, {
-          headers: { 'X-Api-Key': inst.apiKey },
-          params: { includeMovie: true }
+          headers: { 'X-Api-Key': inst.apiKey }
         }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
           console.error(`[Poller] Radarr ${inst.id} queue error:`, err.message);
           return { instance: inst.id, data: { records: [] } };
@@ -98,41 +140,55 @@ async function pollAllServices() {
           return { instance: inst.id, data: { records: [] } };
         })
       ))),
-      timed('Radarr Tags', () => Promise.all(radarrInstances.map(inst =>
-        axios.get(`${inst.url}/api/v3/tag`, {
-          headers: { 'X-Api-Key': inst.apiKey }
-        }).then(res => ({ instance: inst.id, data: res.data })).catch(err => {
-          console.error(`[Poller] Radarr ${inst.id} tags error:`, err.message);
-          return { instance: inst.id, data: [] };
-        })
-      ))),
       timed('qBittorrent', () => getTorrents().catch(err => {
         console.error(`[Poller] qBittorrent error:`, err.message);
         return [];
       }))
-    ]);
+    ];
+
+    // Run slow + fast in parallel
+    const allResults = await Promise.all([...slowTasks, ...fastTasks]);
+    const slowResults = allResults.slice(0, slowTasks.length);
+    const fastResults = allResults.slice(slowTasks.length);
 
     const [
       { result: sabQueues }, { result: sabHistories },
-      { result: sonarrTagsResults }, { result: sonarrQueues },
-      { result: sonarrHistories },
+      { result: sonarrQueues }, { result: sonarrHistories },
       { result: radarrQueues }, { result: radarrHistories },
-      { result: radarrTagsResults },
       { result: qbittorrentTorrents }
-    ] = results;
+    ] = fastResults;
 
     // Store per-task timings
     const totalMs = Date.now() - start;
     lastPollTimings = {
       totalMs,
       timestamp: new Date().toISOString(),
-      tasks: results.map(r => ({ label: r.label, ms: r.ms }))
+      tasks: allResults.map(r => ({ label: r.label, ms: r.ms }))
     };
 
     // When polling is active, TTL is 3x interval to avoid gaps between polls
     // When polling is disabled (on-demand), use 30s so data refreshes on next request after expiry
     const cacheTTL = POLLING_ENABLED ? POLL_INTERVAL * 3 : 30000;
 
+    // Store slow-changing data (only if fetched this cycle)
+    for (const sr of slowResults) {
+      if (sr.label === 'Sonarr Series') {
+        cache.set('poll:sonarr-series', sr.result.flatMap(s => {
+          const inst = sonarrInstances.find(i => i.id === s.instance);
+          return (s.data || []).map(item => ({ ...item, _instanceUrl: inst ? inst.url : null }));
+        }), SLOW_CACHE_TTL);
+      } else if (sr.label === 'Radarr Movies') {
+        cache.set('poll:radarr-movies', sr.result.flatMap(m => {
+          const inst = radarrInstances.find(i => i.id === m.instance);
+          return (m.data || []).map(item => ({ ...item, _instanceUrl: inst ? inst.url : null }));
+        }), SLOW_CACHE_TTL);
+      } else if (sr.label === 'Sonarr Tags') {
+        cache.set('poll:sonarr-tags', sr.result, SLOW_CACHE_TTL);
+      } else if (sr.label === 'Radarr Tags') {
+        cache.set('poll:radarr-tags', sr.result.flatMap(t => t.data || []), SLOW_CACHE_TTL);
+      }
+    }
+
     // SABnzbd
     const firstSabQueue = sabQueues[0] && sabQueues[0].data && sabQueues[0].data.queue;
     cache.set('poll:sab-queue', {
@@ -146,38 +202,21 @@ async function pollAllServices() {
       slots: sabHistories.flatMap(h => (h.data.history && h.data.history.slots) || [])
     }, cacheTTL);
 
-    // Sonarr
-    cache.set('poll:sonarr-tags', sonarrTagsResults, cacheTTL);
-    // Tag queue/history records with _instanceUrl so embedded series/movie objects can build links
+    // Sonarr (lightweight — no embedded series/movie objects)
     cache.set('poll:sonarr-queue', {
-      records: sonarrQueues.flatMap(q => {
-        const inst = sonarrInstances.find(i => i.id === q.instance);
-        const url = inst ? inst.url : null;
-        return (q.data.records || []).map(r => {
-          if (r.series) r.series._instanceUrl = url;
-          return r;
-        });
-      })
+      records: sonarrQueues.flatMap(q => q.data.records || [])
     }, cacheTTL);
     cache.set('poll:sonarr-history', {
       records: sonarrHistories.flatMap(h => h.data.records || [])
     }, cacheTTL);
 
-    // Radarr
+    // Radarr (lightweight — no embedded series/movie objects)
     cache.set('poll:radarr-queue', {
-      records: radarrQueues.flatMap(q => {
-        const inst = radarrInstances.find(i => i.id === q.instance);
-        const url = inst ? inst.url : null;
-        return (q.data.records || []).map(r => {
-          if (r.movie) r.movie._instanceUrl = url;
-          return r;
-        });
-      })
+      records: radarrQueues.flatMap(q => q.data.records || [])
     }, cacheTTL);
     cache.set('poll:radarr-history', {
       records: radarrHistories.flatMap(h => h.data.records || [])
     }, cacheTTL);
-    cache.set('poll:radarr-tags', radarrTagsResults.flatMap(t => t.data || []), cacheTTL);
 
     // qBittorrent
     cache.set('poll:qbittorrent', qbittorrentTorrents, cacheTTL);