diff --git a/src/app/api/insights/targets/route.ts b/src/app/api/insights/targets/route.ts
index 33f8dd864..0489c09df 100644
--- a/src/app/api/insights/targets/route.ts
+++ b/src/app/api/insights/targets/route.ts
@@ -25,6 +25,8 @@ import type {
 } from "@/generated/prisma/client";
 import { apiHandler, requireAuth } from "@/lib/api-handler";
 import { annotate } from "@/lib/logging/context";
+import { cached, caches, type ServerCache } from "@/lib/cache/server-cache";
+import { NO_STORE_BUT_BFCACHE } from "@/lib/http/cache-headers";
 import {
   getEffectiveRange,
   type ThresholdOverridesJson,
@@ -105,9 +107,32 @@ interface TargetPageSummary {
   streakHighlight: { metric: string; days: number } | null;
 }
 
+/**
+ * v1.4.36 W1 — `/api/insights/targets` body, lifted out of the route
+ * handler so `cached()` can wrap it. The handler attaches the
+ * bfcache-friendly Cache-Control header afterward. 60 s TTL keyed on
+ * the user id matches the analytics cache so multiple Insights mounts
+ * inside a minute all hit a warm cache. Invalidated alongside the
+ * analytics bucket on measurement / mood / medication writes.
+ */
+type AuthedUser = Awaited<ReturnType<typeof requireAuth>>["user"];
+
 export const GET = apiHandler(async () => {
   const { user } = await requireAuth();
+  const body = await cached(
+    caches.insightsTargets as ServerCache<
+      Awaited<ReturnType<typeof buildTargetsResponse>>
+    >,
+    user.id,
+    () => buildTargetsResponse(user),
+    annotate,
+  );
+  const response = apiSuccess(body);
+  response.headers.set("Cache-Control", NO_STORE_BUT_BFCACHE);
+  return response;
+});
 
+async function buildTargetsResponse(user: AuthedUser) {
   const userId = user.id;
 
   // v1.4.25 W7b — every per-day bucket key in this route resolves
@@ -1179,7 +1204,7 @@ export const GET = apiHandler(async () => {
     },
   });
 
-  return apiSuccess({
+  return {
     targets,
     pageSummary,
     // Extra diastolic data for BP display
@@ -1194,5 +1219,5 @@ export const GET = apiHandler(async () => {
       gender,
       glucoseUnit,
     },
-  });
-});
+  };
+}
diff --git a/src/lib/cache/invalidate.ts b/src/lib/cache/invalidate.ts
index 4e8f57997..93dcf1f24 100644
--- a/src/lib/cache/invalidate.ts
+++ b/src/lib/cache/invalidate.ts
@@ -31,6 +31,11 @@ export function invalidateUserMeasurements(userId: string): void {
   caches.analytics.deleteByPrefix(`${userId}|`);
   caches.achievements.deleteByPrefix(userId);
   caches.workouts.deleteByPrefix(`${userId}|`);
+  // v1.4.36 W1 — measurement writes change the per-target consistency
+  // strips, the in-range rates and the streak counters that
+  // `/api/insights/targets` computes. Evict the user's bucket so the
+  // next mount paints fresh data.
+  caches.insightsTargets.deleteByPrefix(userId);
 }
 
 /**
@@ -44,6 +49,9 @@ export function invalidateUserMood(userId: string): void {
   caches.moodAnalytics.deleteByPrefix(userId);
   caches.achievements.deleteByPrefix(userId);
   caches.analytics.deleteByPrefix(`${userId}|`);
+  // v1.4.36 W1 — mood writes change the mood target rows on the
+  // insights/targets response (MOOD_SCORE, MOOD_STABILITY).
+  caches.insightsTargets.deleteByPrefix(userId);
 }
 
 /**
@@ -56,6 +64,9 @@ export function invalidateUserMedications(userId: string): void {
   caches.medications.deleteByPrefix(userId);
   caches.medicationsIntake.deleteByPrefix(`${userId}|`);
   caches.achievements.deleteByPrefix(userId);
+  // v1.4.36 W1 — medication writes change the MEDICATION_COMPLIANCE
+  // target rollup (compliance7 / compliance30 / consistency strip).
+  caches.insightsTargets.deleteByPrefix(userId);
 }
 
 /**
diff --git a/src/lib/cache/server-cache.ts b/src/lib/cache/server-cache.ts
index 737ef9ba3..7ed377326 100644
--- a/src/lib/cache/server-cache.ts
+++ b/src/lib/cache/server-cache.ts
@@ -247,6 +247,19 @@ export const caches = {
     maxEntries: 1000,
     ttlMs: 60_000,
   }),
+  /**
+   * v1.4.36 W1 — `/api/insights/targets` is read on every Insights
+   * mount and runs >1 s cold (it pulls 30-day measurements for every
+   * type + medications + intakes + mood + glucose). 60 s TTL matches
+   * the analytics cache so multiple sub-page mounts inside a minute
+   * all hit a warm cache. Invalidated alongside the analytics bucket
+   * on measurement / mood / medication writes.
+   */
+  insightsTargets: new ServerCache<unknown>({
+    name: "insightsTargets",
+    maxEntries: 1000,
+    ttlMs: 60_000,
+  }),
 } as const;
 
 /**