diff --git a/src-tauri/src/commands/system.rs b/src-tauri/src/commands/system.rs
index 997687e..edd00fb 100644
--- a/src-tauri/src/commands/system.rs
+++ b/src-tauri/src/commands/system.rs
@@ -96,13 +96,43 @@ fn wait_until_deletable(path: &std::path::Path, timeout_secs: u64) -> bool {
 #[tauri::command]
 pub async fn clear_moku_cache(app: tauri::AppHandle) -> Result<(), String> {
     let window = app.get_webview_window("main").ok_or("no main window")?;
-    window.clear_all_browsing_data().map_err(|e| e.to_string())?;
+
+    let (tx, rx) = tokio::sync::oneshot::channel::<Result<(), String>>();
+
+    window
+        .with_webview(move |wv| {
+            #[cfg(target_os = "windows")]
+            {
+                use webview2_com::Microsoft::Web::WebView2::Win32::ICoreWebView2_2;
+                use windows::core::Interface;
+                let core = wv.controller().CoreWebView2().map_err(|e| e.to_string());
+                let result = core.and_then(|c| {
+                    c.cast::<ICoreWebView2_2>()
+                        .map_err(|e| e.to_string())
+                })
+                .and_then(|c2| {
+                    unsafe {
+                        c2.ClearBrowsingDataAll(None).map_err(|e| e.to_string())
+                    }
+                });
+                let _ = tx.send(result);
+            }
+            #[cfg(not(target_os = "windows"))]
+            {
+                let _ = tx.send(Ok(()));
+            }
+        })
+        .map_err(|e| e.to_string())?;
+
+    rx.await.map_err(|e| e.to_string())??;
 
     let cache_dir = app.path().app_cache_dir().map_err(|e| e.to_string())?;
     if cache_dir.exists() {
+        wait_until_deletable(&cache_dir, 3);
         remove_dir_best_effort(&cache_dir);
         std::fs::create_dir_all(&cache_dir).map_err(|e| e.to_string())?;
     }
+
     Ok(())
 }
 
@@ -135,7 +165,6 @@ pub fn reset_suwayomi_data(app: tauri::AppHandle) -> Result<(), String> {
     let data_dir = suwayomi_data_dir();
     let targets = ["database.mv.db", "extensions", "settings", "logs", "local"];
 
-    // Wait up to 10s for the JVM to release file locks
     for entry_name in &targets {
         let p = data_dir.join(entry_name);
         if p.exists() {
diff --git a/src/core/cache/imageCache.ts b/src/core/cache/imageCache.ts
index a019bc5..ca990f2 100644
--- a/src/core/cache/imageCache.ts
+++ b/src/core/cache/imageCache.ts
@@ -5,8 +5,9 @@ import { uiAuth } from "@core/auth";
 const cache    = new Map<string, string>();
 const inflight = new Map<string, Promise<string>>();
 const MAX_CONCURRENT = 6;
-let   active = 0;
+let   active   = 0;
 let   drainScheduled = false;
+let   clearing = false;
 
 interface QueueEntry {
   url:      string;
@@ -34,7 +35,9 @@ function getAuthHeaders(): Record<string, string> {
 async function doFetch(url: string): Promise<string> {
   const res = await tauriFetch(url, { method: "GET", headers: getAuthHeaders() });
   if (!res.ok) throw new Error(`${res.status}`);
-  const blobUrl = URL.createObjectURL(await res.blob());
+  const blob = await res.blob();
+  if (clearing) throw new DOMException("Cancelled", "AbortError");
+  const blobUrl = URL.createObjectURL(blob);
   cache.set(url, blobUrl);
   return blobUrl;
 }
@@ -121,8 +124,10 @@ export function cancelQueuedFetches(): void {
 }
 
 export function clearBlobCache(): void {
+  clearing = true;
   cancelQueuedFetches();
   cache.forEach(blob => URL.revokeObjectURL(blob));
   cache.clear();
   inflight.clear();
+  clearing = false;
 }
\ No newline at end of file
diff --git a/src/core/cache/index.ts b/src/core/cache/index.ts
index 8b3d3fe..410c37d 100644
--- a/src/core/cache/index.ts
+++ b/src/core/cache/index.ts
@@ -1,4 +1,4 @@
 export * from './memoryCache';
 export * from './pageCache';
 export * from './imageCache';
-export * from './queryCache';
+export * from './queryCache';
\ No newline at end of file
diff --git a/src/core/cache/memoryCache.ts b/src/core/cache/memoryCache.ts
index e69de29..1cc6431 100644
--- a/src/core/cache/memoryCache.ts
+++ b/src/core/cache/memoryCache.ts
@@ -0,0 +1,44 @@
+interface MemEntry<T> {
+  value:     T;
+  expiresAt: number;
+  key:       string;
+}
+
+export class MemoryCache<T> {
+  readonly #cap: number;
+  readonly #ttl: number;
+  readonly #map = new Map<string, MemEntry<T>>();
+
+  constructor(capacity: number, ttlMs: number) {
+    this.#cap = capacity;
+    this.#ttl = ttlMs;
+  }
+
+  get(key: string): T | undefined {
+    const entry = this.#map.get(key);
+    if (!entry) return undefined;
+    if (Date.now() > entry.expiresAt) { this.#map.delete(key); return undefined; }
+    this.#map.delete(key);
+    this.#map.set(key, entry);
+    return entry.value;
+  }
+
+  set(key: string, value: T): void {
+    if (this.#map.has(key)) this.#map.delete(key);
+    else if (this.#map.size >= this.#cap) this.#map.delete(this.#map.keys().next().value!);
+    this.#map.set(key, { value, expiresAt: Date.now() + this.#ttl, key });
+  }
+
+  has(key: string): boolean {
+    const entry = this.#map.get(key);
+    if (!entry) return false;
+    if (Date.now() > entry.expiresAt) { this.#map.delete(key); return false; }
+    return true;
+  }
+
+  delete(key: string): void { this.#map.delete(key); }
+
+  clear(): void { this.#map.clear(); }
+
+  get size(): number { return this.#map.size; }
+}
\ No newline at end of file
diff --git a/src/core/cache/pageCache.ts b/src/core/cache/pageCache.ts
index 4647849..46f61f3 100644
--- a/src/core/cache/pageCache.ts
+++ b/src/core/cache/pageCache.ts
@@ -62,10 +62,7 @@ export function measureAspect(url: string, useBlob: boolean): Promise<number> {
 }
 
 export function preloadImage(url: string, useBlob: boolean): void {
-  if (useBlob) {
-    preloadBlobUrls([url], 0);
-    return;
-  }
+  if (useBlob) { preloadBlobUrls([url], 0); return; }
   resolveUrl(url, useBlob).then(src => { new Image().src = src; }).catch(() => {});
 }
 
diff --git a/src/core/cache/queryCache.ts b/src/core/cache/queryCache.ts
index b2fbd08..4eae1cf 100644
--- a/src/core/cache/queryCache.ts
+++ b/src/core/cache/queryCache.ts
@@ -1,11 +1,14 @@
 interface Entry<T> {
   promise:   Promise<T>;
   fetchedAt: number;
+  fetcher?:  () => Promise<T>;
+  ttl?:      number;
 }
 
 const store  = new Map<string, Entry<unknown>>();
 const subs   = new Map<string, Set<() => void>>();
-const groups = new Map<string, Set<string>>();
+const keyToGroups = new Map<string, Set<string>>();
+const groups      = new Map<string, Set<string>>();
 
 export const DEFAULT_TTL_MS = 5 * 60 * 1_000;
 
@@ -16,6 +19,16 @@ function registerGroups(key: string, group?: string | string[]) {
   for (const tag of Array.isArray(group) ? group : [group]) {
     if (!groups.has(tag)) groups.set(tag, new Set());
     groups.get(tag)!.add(key);
+    if (!keyToGroups.has(key)) keyToGroups.set(key, new Set());
+    keyToGroups.get(key)!.add(tag);
+  }
+}
+
+function unregisterKey(key: string) {
+  const tags = keyToGroups.get(key);
+  if (tags) {
+    for (const tag of tags) groups.get(tag)?.delete(key);
+    keyToGroups.delete(key);
   }
 }
 
@@ -27,14 +40,20 @@ export const cache = {
       if (err?.name !== "AbortError") store.delete(key);
       return Promise.reject(err);
     }) as Promise<T>;
-    store.set(key, { promise, fetchedAt: Date.now() });
+    store.set(key, { promise, fetchedAt: Date.now(), fetcher: fetcher as () => Promise<unknown>, ttl });
     registerGroups(key, group);
     promise.then(() => notify(key)).catch(() => {});
     return promise;
   },
 
   set<T>(key: string, value: T, group?: string | string[]) {
-    store.set(key, { promise: Promise.resolve(value), fetchedAt: Date.now() });
+    const existing = store.get(key) as Entry<T> | undefined;
+    store.set(key, {
+      promise: Promise.resolve(value),
+      fetchedAt: Date.now(),
+      fetcher: existing?.fetcher,
+      ttl: existing?.ttl,
+    });
     registerGroups(key, group);
     notify(key);
   },
@@ -43,10 +62,38 @@ export const cache = {
     const existing = store.get(key) as Entry<T> | undefined;
     if (!existing) return;
     const next = existing.promise.then(fn);
-    store.set(key, { promise: next, fetchedAt: Date.now() });
+    store.set(key, { ...existing, promise: next, fetchedAt: Date.now() });
     next.then(() => notify(key)).catch(() => {});
   },
 
+  refresh<T>(key: string): Promise<T> | undefined {
+    const existing = store.get(key) as Entry<T> | undefined;
+    if (!existing?.fetcher) return undefined;
+    const promise = (existing.fetcher as () => Promise<T>)().catch(err => {
+      if (err?.name !== "AbortError") store.delete(key);
+      return Promise.reject(err);
+    });
+    store.set(key, { ...existing, promise: promise as Promise<unknown>, fetchedAt: Date.now() });
+    promise.then(() => notify(key)).catch(() => {});
+    return promise;
+  },
+
+  refreshGroup(tag: string): void {
+    const keys = groups.get(tag);
+    if (!keys) return;
+    for (const key of [...keys]) {
+      const existing = store.get(key);
+      if (existing?.fetcher) {
+        const promise = existing.fetcher().catch(err => {
+          if (err?.name !== "AbortError") store.delete(key);
+          return Promise.reject(err);
+        });
+        store.set(key, { ...existing, promise, fetchedAt: Date.now() });
+        promise.then(() => notify(key)).catch(() => {});
+      }
+    }
+  },
+
   has(key: string): boolean { return store.has(key); },
 
   ageOf(key: string): number | undefined {
@@ -54,18 +101,35 @@ export const cache = {
     return e ? Date.now() - e.fetchedAt : undefined;
   },
 
-  clear(key: string) { store.delete(key); notify(key); },
+  isStale(key: string): boolean {
+    const e = store.get(key);
+    if (!e) return true;
+    return Date.now() - e.fetchedAt >= (e.ttl ?? DEFAULT_TTL_MS);
+  },
+
+  clear(key: string) {
+    unregisterKey(key);
+    store.delete(key);
+    notify(key);
+  },
 
   clearGroup(tag: string) {
     const keys = groups.get(tag);
     if (!keys) return;
-    for (const key of keys) { store.delete(key); notify(key); }
+    for (const key of [...keys]) {
+      keyToGroups.get(key)?.delete(tag);
+      if (keyToGroups.get(key)?.size === 0) keyToGroups.delete(key);
+      store.delete(key);
+      notify(key);
+    }
     groups.delete(tag);
   },
 
   clearAll() {
     const allKeys = [...store.keys()];
-    store.clear(); groups.clear();
+    store.clear();
+    groups.clear();
+    keyToGroups.clear();
     allKeys.forEach(notify);
   },
 
@@ -161,7 +225,9 @@ export function getTopSources<T extends { id: string }>(sources: T[]): T[] {
 }
 
 export async function refreshMangaCache(mangaId: number, thumbnailUrl?: string): Promise<void> {
-  cache.clear(CACHE_KEYS.MANGA(mangaId));
+  const didRefresh = cache.refresh(CACHE_KEYS.MANGA(mangaId));
+  if (!didRefresh) cache.clear(CACHE_KEYS.MANGA(mangaId));
+
   cache.clear(CACHE_KEYS.CHAPTERS(mangaId));
   cache.clear(CACHE_KEYS.LIBRARY);
   cache.clear(CACHE_KEYS.ALL_MANGA);
diff --git a/src/features/settings/sections/StorageSettings.svelte b/src/features/settings/sections/StorageSettings.svelte
index bef46b9..380be68 100644
--- a/src/features/settings/sections/StorageSettings.svelte
+++ b/src/features/settings/sections/StorageSettings.svelte
@@ -13,17 +13,18 @@
   import type { BackupEntry } from "@core/persistence/persist";
   import { DEFAULT_SETTINGS } from "@types/settings";
   import { DEFAULT_READING_STATS } from "@types/history";
+  import { clearBlobCache } from "@core/cache/imageCache";
+  import { clearPageCache } from "@core/cache/pageCache";
+  import { cache as queryCache } from "@core/cache/queryCache";
 
   type ResetState = "idle" | "busy" | "done" | "error";
   interface ResetItem { key: string; label: string; desc: string; state: ResetState; error: string | null; confirm: boolean; }
 
   let resetItems = $state<ResetItem[]>([
-    { key: "moku-cache",      label: "Clear Moku cache",         desc: "Removes image cache and temporary files stored by Moku.",                                                          state: "idle", error: null, confirm: false },
-    { key: "suwayomi-cache",  label: "Clear Suwayomi cache",     desc: "Deletes the Suwayomi cache and KCEF directories inside the data folder.",                                          state: "idle", error: null, confirm: false },
-    { key: "server-cache",    label: "Clear server image cache", desc: "Removes cached chapter pages and thumbnails stored on the Suwayomi server.",                                       state: "idle", error: null, confirm: false },
-    { key: "reading-history", label: "Clear reading history",  desc: "Erases chapter history, read log, reading stats, and daily read counts.",                                            state: "idle", error: null, confirm: true  },
-    { key: "moku-settings",   label: "Reset Moku settings",    desc: "Restores all app settings to their defaults. Does not affect library data.",                                         state: "idle", error: null, confirm: true  },
-    { key: "suwayomi-data",   label: "Reset Suwayomi data",    desc: "Deletes the database, extensions, settings, and logs. Downloads and backups are preserved.",                         state: "idle", error: null, confirm: true  },
+    { key: "all-cache",      label: "Clear all caches",      desc: "Flushes the image blob cache, page cache, query cache, Moku disk cache, Suwayomi disk cache, and server image/thumbnail cache in one pass.", state: "idle", error: null, confirm: false },
+    { key: "reading-history", label: "Clear reading history", desc: "Erases chapter history, read log, reading stats, and daily read counts.",                                                                   state: "idle", error: null, confirm: true  },
+    { key: "moku-settings",   label: "Reset Moku settings",   desc: "Restores all app settings to their defaults. Does not affect library data.",                                                                  state: "idle", error: null, confirm: true  },
+    { key: "suwayomi-data",   label: "Reset Suwayomi data",   desc: "Deletes the database, extensions, settings, and logs. Downloads and backups are preserved.",                                                  state: "idle", error: null, confirm: true  },
   ]);
 
   let confirming = $state<string | null>(null);
@@ -73,19 +74,24 @@
     });
   }
 
+  async function clearAllCaches(): Promise<void> {
+    clearBlobCache();
+    clearPageCache();
+    queryCache.clearAll();
+    await Promise.all([
+      invoke("clear_moku_cache"),
+      invoke("clear_suwayomi_cache"),
+      gql(CLEAR_CACHED_IMAGES, { cachedPages: true, cachedThumbnails: true, downloadedThumbnails: false }),
+    ]);
+  }
+
   async function runReset(key: string) {
     confirming = null;
     patchReset(key, { state: "busy", error: null });
     try {
       switch (key) {
-        case "moku-cache":
-          await invoke("clear_moku_cache");
-          break;
-        case "suwayomi-cache":
-          await invoke("clear_suwayomi_cache");
-          break;
-        case "server-cache":
-          await gql(CLEAR_CACHED_IMAGES, { cachedPages: true, cachedThumbnails: true, downloadedThumbnails: false });
+        case "all-cache":
+          await clearAllCaches();
           break;
         case "reading-history":
           store.clearHistory();