diff --git a/packages/backend/src/core/FederatedInstanceService.ts b/packages/backend/src/core/FederatedInstanceService.ts
index 9e315e23f5..73bbf03b26 100644
--- a/packages/backend/src/core/FederatedInstanceService.ts
+++ b/packages/backend/src/core/FederatedInstanceService.ts
@@ -70,6 +70,24 @@ export class FederatedInstanceService implements OnApplicationShutdown {
 		}
 	}
 
+	@bindThis
+	public async fetch(host: string): Promise<MiInstance | null> {
+		host = this.utilityService.toPuny(host);
+
+		const cached = await this.federatedInstanceCache.get(host);
+		if (cached !== undefined) return cached;
+
+		const index = await this.instancesRepository.findOneBy({ host });
+
+		if (index == null) {
+			this.federatedInstanceCache.set(host, null);
+			return null;
+		} else {
+			this.federatedInstanceCache.set(host, index);
+			return index;
+		}
+	}
+
 	@bindThis
 	public async update(id: MiInstance['id'], data: Partial<MiInstance>): Promise<void> {
 		const result = await this.instancesRepository.createQueryBuilder().update()
diff --git a/packages/backend/src/queue/processors/DeliverProcessorService.ts b/packages/backend/src/queue/processors/DeliverProcessorService.ts
index 1688b7836f..5a16496011 100644
--- a/packages/backend/src/queue/processors/DeliverProcessorService.ts
+++ b/packages/backend/src/queue/processors/DeliverProcessorService.ts
@@ -77,8 +77,14 @@ export class DeliverProcessorService {
 			this.apRequestChart.deliverSucc();
 			this.federationChart.deliverd(host, true);
 
-			// Update stats
-			this.federatedInstanceService.fetchOrRegister(host).then(i => {
+			// Update instance stats
+			process.nextTick(async () => {
+				const i = await (this.meta.enableStatsForFederatedInstances
+					? this.federatedInstanceService.fetchOrRegister(host)
+					: this.federatedInstanceService.fetch(host));
+
+				if (i == null) return;
+
 				if (i.isNotResponding) {
 					this.federatedInstanceService.update(i.id, {
 						isNotResponding: false,
@@ -86,7 +92,9 @@ export class DeliverProcessorService {
 					});
 				}
 
-				this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
+				if (this.meta.enableStatsForFederatedInstances) {
+					this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
+				}
 
 				if (this.meta.enableChartsForFederatedInstances) {
 					this.instanceChart.requestSent(i.host, true);
@@ -98,7 +106,7 @@ export class DeliverProcessorService {
 			this.apRequestChart.deliverFail();
 			this.federationChart.deliverd(host, false);
 
-			// Update stats
+			// Update instance stats
 			this.federatedInstanceService.fetchOrRegister(host).then(i => {
 				if (!i.isNotResponding) {
 					this.federatedInstanceService.update(i.id, {
diff --git a/packages/backend/src/queue/processors/InboxProcessorService.ts b/packages/backend/src/queue/processors/InboxProcessorService.ts
index 591cf1a55d..95d764e4d8 100644
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@@ -195,21 +195,25 @@ export class InboxProcessorService implements OnApplicationShutdown {
 		this.apRequestChart.inbox();
 		this.federationChart.inbox(authUser.user.host);
 
-		// Update stats
-		if (this.meta.enableStatsForFederatedInstances) {
-			this.federatedInstanceService.fetchOrRegister(authUser.user.host).then(i => {
-				this.updateInstanceQueue.enqueue(i.id, {
-					latestRequestReceivedAt: new Date(),
-					shouldUnsuspend: i.suspensionState === 'autoSuspendedForNotResponding',
-				});
+		// Update instance stats
+		process.nextTick(async () => {
+			const i = await (this.meta.enableStatsForFederatedInstances
+				? this.federatedInstanceService.fetchOrRegister(authUser.user.host)
+				: this.federatedInstanceService.fetch(authUser.user.host));
 
-				if (this.meta.enableChartsForFederatedInstances) {
-					this.instanceChart.requestReceived(i.host);
-				}
+			if (i == null) return;
 
-				this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
+			this.updateInstanceQueue.enqueue(i.id, {
+				latestRequestReceivedAt: new Date(),
+				shouldUnsuspend: i.suspensionState === 'autoSuspendedForNotResponding',
 			});
-		}
+
+			if (this.meta.enableChartsForFederatedInstances) {
+				this.instanceChart.requestReceived(i.host);
+			}
+
+			this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
+		});
 
 		// アクティビティを処理
 		try {