diff --git a/app/Http/Controllers/User/ImageController.php b/app/Http/Controllers/User/ImageController.php
index 17f673a8..f9d63bab 100644
--- a/app/Http/Controllers/User/ImageController.php
+++ b/app/Http/Controllers/User/ImageController.php
@@ -12,6 +12,7 @@ use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Http\Request;
 use Illuminate\Http\Response;
 use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\DB;
 use Illuminate\View\View;
 use League\Flysystem\FilesystemException;
@@ -105,23 +106,34 @@ class ImageController extends Controller
         }, headers: ['Content-type' => $image->mimetype]);
     }
 
-    public function thumbnail(Request $request)
+    public function thumbnail(Request $request): StreamedResponse
     {
         /** @var Image $image */
         $image = Image::query()
             ->where('key', $request->route('key'))
             ->where('extension', $request->route('extension'))
             ->firstOr(fn() => abort(404));
+
         try {
-            $stream = $image->filesystem()->readStream($image->pathname);
+            $cacheKey = "image_thumb_{$image->key}";
+
+            if (Cache::has($cacheKey)) {
+                $contents = Cache::get($cacheKey);
+            } else {
+                $stream = $image->filesystem()->readStream($image->pathname);
+                $img = \Intervention\Image\Facades\Image::make($stream);
+                $width = (int)($image->width / 2);
+                $height = (int)($image->height / 2);
+                $contents = $img->fit($width, $height, fn($constraint) => $constraint->upsize())->encode();
+                Cache::rememberForever($cacheKey, fn () => (string)$contents);
+            }
         } catch (FilesystemException $e) {
             abort(404);
         }
-        $img = \Intervention\Image\Facades\Image::make($stream);
-        $width = $image->width;
-        $height = $image->height;
-        $img->fit((int)($width / 2), (int)($height / 2), fn($constraint) => $constraint->upsize());
-        return $img->response();
+
+        return \response()->stream(function () use ($contents) {
+            echo $contents;
+        }, headers: ['Content-type' => $image->mimetype]);
     }
 
     public function permission(Request $request): Response
diff --git a/resources/views/components/upload.blade.php b/resources/views/components/upload.blade.php
index 7324ca19..26e6bd54 100644
--- a/resources/views/components/upload.blade.php
+++ b/resources/views/components/upload.blade.php
@@ -4,10 +4,11 @@
     <div class="mb-4 p-4 bg-white rounded-md">
         <h1 class="tracking-wider text-2xl text-gray-700 mb-2" style="text-shadow: -4px 4px 0 rgb(0 0 0 / 10%);">Image Upload</h1>
         <p class="text-gray-500 text-sm">
-            最大可上传 1.00 MB 的图片，上传队列最多
             @if(Auth::check() && Auth::user()->group)
+                最大可上传 {{ \App\Utils::formatSize(Auth::user()->group->configs->get(\App\Enums\GroupConfigKey::MaximumFileSize) * 1024) }} 的图片，上传队列最多
                 {{ Auth::user()->group->configs->get(\App\Enums\GroupConfigKey::ConcurrentUploadNum) }}
             @else
+                最大可上传 {{ \App\Utils::formatSize(\App\Models\Group::getDefaultConfigs()->get(\App\Enums\GroupConfigKey::MaximumFileSize) * 1024) }} 的图片，上传队列最多
                 {{ \App\Models\Group::getDefaultConfigs()->get(\App\Enums\GroupConfigKey::ConcurrentUploadNum) }}
             @endif
             张。本站已托管 {{ \App\Models\Image::query()->count() }} 张图片。
@@ -74,6 +75,15 @@
     <script src="{{ asset('js/clipboard/clipboard.min.js') }}"></script>
 @endpush
 @push('scripts')
+    @if(Auth::check() && Auth::user()->group)
+    <script>
+        let maxSize = {{ Auth::user()->group->configs->get(\App\Enums\GroupConfigKey::MaximumFileSize) * 1024 }}
+    </script>
+    @else
+    <script>
+        let maxSize = {{ \App\Models\Group::getDefaultConfigs()->get(\App\Enums\GroupConfigKey::MaximumFileSize) * 1024 }}
+    </script>
+    @endif
     <script>
         (new ClipboardJS('#copy-all', {
             text: function(trigger) {
@@ -154,8 +164,8 @@
                     toastr.warning(`不支持的文件格式 ${file.name}`);
                     return false;
                 }
-                if (file.size > 5242880) {
-                    toastr.warning(`文件 ${file.name} 超出大小限制(最大5MB)`);
+                if (file.size > maxSize) {
+                    toastr.warning(`文件 ${file.name} 超出大小限制`);
                     return false;
                 }
                 let guid = utils.guid();