diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 00000000..3ec857ac
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2024-03-24 - Optimize Gateway API Fetch Concurrency in Astro API routes
+**Learning:** Initiating slow external network requests sequentially after local database queries and filesystem checks creates a bottleneck in Astro API route response times.
+**Action:** When an API handler requires both external fetches and local data, start the external fetch as a Promise at the very beginning of the handler (with a dummy catch to prevent unhandled rejection crashes), execute the local operations, and then `await` the Promise at the end to parallelize the workloads.
\ No newline at end of file
diff --git a/src/pages/api/dashboard-projects-health.ts b/src/pages/api/dashboard-projects-health.ts
index c9947031..22c15362 100644
--- a/src/pages/api/dashboard-projects-health.ts
+++ b/src/pages/api/dashboard-projects-health.ts
@@ -30,6 +30,10 @@ function mapSessionToRunState(raw: Record<string, unknown>): { running: boolean
 /** GET — état synthétique pour la carte Projets du dashboard (poll léger). */
 export const GET: APIRoute = async ({ locals }) => {
   const email = locals.user?.email as string | undefined;
+  const zimaosSessionPromise = fetchZimaOSSessionsPayload(email);
+  // Attach a dummy catch handler immediately to prevent UnhandledPromiseRejection
+  // if the fetch fails before we await it later in the final try/catch block.
+  zimaosSessionPromise.catch(() => {});
 
   const payload: {
     projects: Array<{
@@ -150,7 +154,7 @@ export const GET: APIRoute = async ({ locals }) => {
   }
 
   try {
-    const oc = await fetchZimaOSSessionsPayload(email);
+    const oc = await zimaosSessionPromise;
     payload.swarm.zimaosOk = oc.ok;
     const sessions = oc.ok
       ? (normalizeZimaOSSessions(oc.data) as Record<string, unknown>[])