diff --git a/src/views/home/agent/components/Preview.vue b/src/views/home/agent/components/Preview.vue
index 88a413e..b660970 100644
--- a/src/views/home/agent/components/Preview.vue
+++ b/src/views/home/agent/components/Preview.vue
@@ -210,15 +210,43 @@
 
 	const urlLoading = ref(false)
 	const fetchedUrlSet = ref<Set<string>>(new Set())
+
+	const BATCH_SIZE = 4
+	let isFetchingUrls = false
+	let pendingUrlList: string[] | null = null
+
+	const fetchBatch = async (batch: string[]) => {
+		const res = await fetchUrlTitle(batch)
+		batch.forEach((url) => fetchedUrlSet.value.add(url))
+		urlList.value = [...urlList.value, ...res]
+	}
+
 	const setUrls = async (list: string[]) => {
 		reportType.value = 'urls'
 		const newUrls = [...new Set(list.filter((url) => !fetchedUrlSet.value.has(url)))]
 		if (newUrls.length === 0) return
-		urlLoading.value = true
-		const res = await fetchUrlTitle(newUrls)
-		urlLoading.value = false
-		newUrls.forEach((url) => fetchedUrlSet.value.add(url))
-		urlList.value = [...urlList.value, ...res]
+
+		if (isFetchingUrls) {
+			pendingUrlList = list
+			return
+		}
+
+		isFetchingUrls = true
+		if (urlList.value.length < 1) {
+			urlLoading.value = true
+		}
+		for (let i = 0; i < newUrls.length; i += BATCH_SIZE) {
+			const batch = newUrls.slice(i, i + BATCH_SIZE)
+			await fetchBatch(batch)
+			urlLoading.value = false
+		}
+		isFetchingUrls = false
+
+		if (pendingUrlList) {
+			const next = pendingUrlList
+			pendingUrlList = null
+			setUrls(next)
+		}
 	}
 	// watch(
 	// 	() => sessionId.value,