diff --git a/frontend/components/displayBWASummary.vue b/frontend/components/displayBWASummary.vue
index 16f4ef4..0acf563 100644
--- a/frontend/components/displayBWASummary.vue
+++ b/frontend/components/displayBWASummary.vue
@@ -11,6 +11,7 @@ import {
 } from "~/composables/useDepreciation"
 
 const loading = ref(true)
+const { loadCoreData } = useDashboardData()
 const summary = ref({
   label: "",
   income: 0,
@@ -47,11 +48,11 @@ const loadSummary = async () => {
       end: dayjs().endOf("month")
     }
 
-    const [docs, incoming, allocations] = await Promise.all([
-      useEntities("createddocuments").select(),
-      useEntities("incominginvoices").select(),
+    const [coreData, allocations] = await Promise.all([
+      loadCoreData(),
       useEntities("statementallocations").select("*, bankstatement(*)")
     ])
+    const { createdDocuments: docs, incomingInvoices: incoming } = coreData
 
     const outputDocs = (docs || []).filter((doc: any) => {
       if (!isRelevantOutputDocument(doc)) {
diff --git a/frontend/components/displayIncomeAndExpenditure.vue b/frontend/components/displayIncomeAndExpenditure.vue
index c934f63..863405d 100644
--- a/frontend/components/displayIncomeAndExpenditure.vue
+++ b/frontend/components/displayIncomeAndExpenditure.vue
@@ -17,6 +17,7 @@ const props = defineProps({
 })
 
 const tempStore = useTempStore()
+const { loadCoreData } = useDashboardData()
 const isMounted = ref(false)
 
 const amountMode = ref("net")
@@ -82,10 +83,7 @@ watch([amountMode, granularity, selectedYear, selectedMonth], () => {
 })
 
 const loadData = async () => {
-  const [docs, incoming] = await Promise.all([
-    useEntities("createddocuments").select(),
-    useEntities("incominginvoices").select()
-  ])
+  const { createdDocuments: docs, incomingInvoices: incoming } = await loadCoreData()
 
   incomeDocuments.value = (docs || []).filter((item) => item.state === "Gebucht" && ["invoices", "advanceInvoices", "cancellationInvoices"].includes(item.type))
   expenseInvoices.value = (incoming || []).filter((item) => item.state === "Gebucht" && item.date)
diff --git a/frontend/components/displayTaxSummary.vue b/frontend/components/displayTaxSummary.vue
index 7adf9ac..db99e5b 100644
--- a/frontend/components/displayTaxSummary.vue
+++ b/frontend/components/displayTaxSummary.vue
@@ -13,6 +13,7 @@ import {
 dayjs.extend(customParseFormat)
 
 const auth = useAuthStore()
+const { loadCoreData } = useDashboardData()
 
 const loading = ref(true)
 const summary = ref({
@@ -39,10 +40,7 @@ const loadSummary = async () => {
     const periodType = normalizeTaxEvaluationPeriod(auth.activeTenantData?.taxEvaluationPeriod)
     const bounds = getTaxEvaluationPeriodBounds(dayjs(), periodType)
 
-    const [docs, incoming] = await Promise.all([
-      useEntities("createddocuments").select(),
-      useEntities("incominginvoices").select()
-    ])
+    const { createdDocuments: docs, incomingInvoices: incoming } = await loadCoreData()
 
     const outputDocs = (docs || []).filter((doc: any) => {
       if (doc?.state !== "Gebucht") return false
diff --git a/frontend/composables/useDashboardData.ts b/frontend/composables/useDashboardData.ts
new file mode 100644
index 0000000..d92acf8
--- /dev/null
+++ b/frontend/composables/useDashboardData.ts
@@ -0,0 +1,54 @@
+type DashboardCoreData = {
+  createdDocuments: any[]
+  incomingInvoices: any[]
+}
+
+const CACHE_TTL_MS = 30_000
+
+type DashboardCacheEntry = {
+  cachedAt: number
+  data: DashboardCoreData | null
+  pendingRequest: Promise<DashboardCoreData> | null
+}
+
+const tenantCaches = new Map<string, DashboardCacheEntry>()
+
+/**
+ * Bündelt die großen, von mehreren Dashboard-Karten benötigten Abfragen.
+ * So werden identische Requests beim parallelen Mounten nur einmal ausgeführt.
+ */
+export const useDashboardData = () => {
+  const auth = useAuthStore()
+
+  const getTenantKey = () => String(auth.activeTenant || auth.activeTenantData?.id || "default")
+
+  const loadCoreData = async (force = false): Promise<DashboardCoreData> => {
+    const tenantKey = getTenantKey()
+    const cache = tenantCaches.get(tenantKey) || { cachedAt: 0, data: null, pendingRequest: null }
+    tenantCaches.set(tenantKey, cache)
+    const cacheIsFresh = cache.data && Date.now() - cache.cachedAt < CACHE_TTL_MS
+
+    if (!force && cacheIsFresh) return cache.data
+    if (!force && cache.pendingRequest) return cache.pendingRequest
+
+    cache.pendingRequest = Promise.all([
+      useEntities("createddocuments").select(),
+      useEntities("incominginvoices").select()
+    ])
+      .then(([createdDocuments, incomingInvoices]) => {
+        cache.data = {
+          createdDocuments: createdDocuments || [],
+          incomingInvoices: incomingInvoices || []
+        }
+        cache.cachedAt = Date.now()
+        return cache.data
+      })
+      .finally(() => {
+        cache.pendingRequest = null
+      })
+
+    return cache.pendingRequest
+  }
+
+  return { loadCoreData }
+}
diff --git a/frontend/pages/index.client.vue b/frontend/pages/index.client.vue
index 2e8f8f6..8a54db8 100644
--- a/frontend/pages/index.client.vue
+++ b/frontend/pages/index.client.vue
@@ -2,13 +2,13 @@
 import { setPageLayout } from "#app"
 import "gridstack/dist/gridstack.min.css"
 
-import DisplayIncomeAndExpenditure from "~/components/displayIncomeAndExpenditure.vue"
-import DisplayOpenBalances from "~/components/displayOpenBalances.vue"
-import DisplayBankaccounts from "~/components/displayBankaccounts.vue"
-import DisplayProjectsInPhases from "~/components/displayProjectsInPhases.vue"
-import DisplayOpenTasks from "~/components/displayOpenTasks.vue"
-import DisplayTaxSummary from "~/components/displayTaxSummary.vue"
-import DisplayBWASummary from "~/components/displayBWASummary.vue"
+const DisplayIncomeAndExpenditure = defineAsyncComponent(() => import("~/components/displayIncomeAndExpenditure.vue"))
+const DisplayOpenBalances = defineAsyncComponent(() => import("~/components/displayOpenBalances.vue"))
+const DisplayBankaccounts = defineAsyncComponent(() => import("~/components/displayBankaccounts.vue"))
+const DisplayProjectsInPhases = defineAsyncComponent(() => import("~/components/displayProjectsInPhases.vue"))
+const DisplayOpenTasks = defineAsyncComponent(() => import("~/components/displayOpenTasks.vue"))
+const DisplayTaxSummary = defineAsyncComponent(() => import("~/components/displayTaxSummary.vue"))
+const DisplayBWASummary = defineAsyncComponent(() => import("~/components/displayBWASummary.vue"))
 
 setPageLayout("default")