diff --git a/app/Livewire/Project/Application/PreviewDomains.php b/app/Livewire/Project/Application/PreviewDomains.php
index c3a287f8b9..89b9c4fb5b 100644
--- a/app/Livewire/Project/Application/PreviewDomains.php
+++ b/app/Livewire/Project/Application/PreviewDomains.php
@@ -28,6 +28,15 @@ class PreviewDomains extends Component
 
     public ?string $newDomainService = null;
 
+    /**
+     * Parsed once on mount and on save. Each parse queues a file sync job, so the
+     * 2-second DNS poll must not parse the compose file on every render.
+     *
+     * @var array<int, string>
+     */
+    #[Locked]
+    public array $composeServices = [];
+
     public array $editingDomainParts = ['scheme' => 'https', 'host' => '', 'port' => '', 'path' => ''];
 
     public ?int $editingIndex = null;
@@ -45,7 +54,8 @@ class PreviewDomains extends Component
         $this->authorize('view', $this->preview->application);
         $this->refreshDomains();
         if ($this->preview->application->build_pack === 'dockercompose') {
-            $this->newDomainService = $this->composeServices()[0] ?? null;
+            $this->composeServices = $this->composeServices();
+            $this->newDomainService = $this->composeServices[0] ?? null;
         }
     }
 
@@ -53,7 +63,6 @@ class PreviewDomains extends Component
     {
         return view('livewire.project.application.preview-domains', [
             'isCompose' => $this->preview->application->build_pack === 'dockercompose',
-            'composeServices' => $this->composeServices(),
         ]);
     }
 
@@ -61,7 +70,7 @@ class PreviewDomains extends Component
     {
         $this->authorize('update', $this->preview->application);
         if ($this->preview->application->build_pack === 'dockercompose'
-            && ($this->newDomainService === null || ! in_array($this->newDomainService, $this->composeServices(), true))) {
+            && ($this->newDomainService === null || ! in_array($this->newDomainService, $this->composeServices, true))) {
             $this->addError('newDomainService', 'Select a valid Compose service.');
 
             return;
@@ -96,7 +105,7 @@ class PreviewDomains extends Component
         $domain = $this->domainRows[$index]['url'] ?? DomainPortOverrides::withoutPort($domain);
         $this->newDomainParts = DomainUrlParts::empty();
         $this->newDomainService = $this->preview->application->build_pack === 'dockercompose'
-            ? ($this->composeServices()[0] ?? null)
+            ? ($this->composeServices[0] ?? null)
             : null;
         $this->forceUseUnknownPort = false;
         $this->dispatch('close-preview-domain-add', previewId: $this->preview->id);
@@ -455,6 +464,7 @@ class PreviewDomains extends Component
         if ($this->preview->application->build_pack === 'dockercompose') {
             try {
                 $composeServices = $this->composeServices(failOnError: true);
+                $this->composeServices = $composeServices;
             } catch (\Throwable) {
                 $this->refreshDomains();
                 $this->dispatch('error', 'Compose configuration could not be parsed. Preview domains were not changed.');
diff --git a/tests/Feature/PreviewDomainPortOverridesTest.php b/tests/Feature/PreviewDomainPortOverridesTest.php
index e81738f6ac..535cacf338 100644
--- a/tests/Feature/PreviewDomainPortOverridesTest.php
+++ b/tests/Feature/PreviewDomainPortOverridesTest.php
@@ -1,6 +1,7 @@
 <?php
 
 use App\Jobs\CheckDomainDnsJob;
+use App\Jobs\ServerFilesFromServerJob;
 use App\Livewire\Project\Application\PreviewDomains;
 use App\Models\Application;
 use App\Models\ApplicationPreview;
@@ -11,7 +12,9 @@ use App\Models\Server;
 use App\Models\StandaloneDocker;
 use App\Models\Team;
 use App\Models\User;
+use Illuminate\Bus\UniqueLock;
 use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Cache;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Queue;
 use Illuminate\Support\Str;
@@ -1053,3 +1056,26 @@ it('preserves readonly compose preview redirects when saving an address', functi
         'api' => ['domain' => '', 'redirect' => 'www'],
     ]);
 });
+
+it('does not queue file sync jobs when polling dns checks for compose previews', function () {
+    Queue::fake();
+
+    $this->application->update([
+        'build_pack' => 'dockercompose',
+        'docker_compose_raw' => "services:\n  web:\n    image: nginx:alpine\n    volumes:\n      - web-data:/data\n  api:\n    image: nginx:alpine\n    volumes:\n      - api-data:/data\nvolumes:\n  web-data:\n  api-data:\n",
+    ]);
+    $preview = createPreviewForPortTests($this->application->fresh(), 101, [
+        'docker_compose_domains' => json_encode(['web' => ['domain' => 'https://compose-preview-poll.invalid']]),
+    ]);
+
+    $component = Livewire::test(PreviewDomains::class, ['preview' => $preview]);
+    $queuedOnMount = Queue::pushed(ServerFilesFromServerJob::class);
+
+    // A worker that starts the queued job releases its unique lock, so the next parse queues a new one.
+    Cache::lock(UniqueLock::getKey($queuedOnMount->first()))->forceRelease();
+    $component->call('pollDnsChecks')->call('pollDnsChecks')->call('pollDnsChecks');
+
+    expect($queuedOnMount)->toHaveCount(1)
+        ->and(Queue::pushed(ServerFilesFromServerJob::class))->toHaveCount(1)
+        ->and($component->get('composeServices'))->toBe(['web', 'api']);
+});