diff --git a/backend/services/log_query.go b/backend/services/log_query.go
index 2c4d16f..4e027c1 100644
--- a/backend/services/log_query.go
+++ b/backend/services/log_query.go
@@ -23,6 +23,9 @@ import (
 	"lokistack/repository"
 )
 
+// maxLogQueryLimit 单页硬上限。依据：实测每条日志约 671B——
+// 1000 条 ≈ 655KB 响应；而前端结果表**没有虚拟滚动**，1000 行会全部渲染成
+// DOM 节点导致卡顿。前端下拉只给到 1000，超过会被这里静默收敛。
 const maxLogQueryLimit = 1000
 const logQueryTimeout = 120 * time.Second
 
diff --git a/frontend/src/i18n/locales/en/logs.ts b/frontend/src/i18n/locales/en/logs.ts
index c09308a..4336548 100644
--- a/frontend/src/i18n/locales/en/logs.ts
+++ b/frontend/src/i18n/locales/en/logs.ts
@@ -20,7 +20,7 @@ export default {
     sourceAria: 'Data source',
     sourceEmptyOption: 'No data sources available',
     limitLabel: 'Per page',
-    limitHint: 'Up to 1000 entries per page; paging keeps only the current page.',
+    limitHint: 'Default 200 entries (~0.7KB each). For very dense logs, narrow the time range or add filters instead of raising the page size.',
     rangeInvalid: 'Select a valid start and end time',
     queryFailed: 'Query failed',
   },
diff --git a/frontend/src/i18n/locales/zh/logs.ts b/frontend/src/i18n/locales/zh/logs.ts
index 58a2e97..56f6e71 100644
--- a/frontend/src/i18n/locales/zh/logs.ts
+++ b/frontend/src/i18n/locales/zh/logs.ts
@@ -19,7 +19,7 @@ export default {
     sourceAria: '数据源',
     sourceEmptyOption: '暂无可用数据源',
     limitLabel: '每页条数',
-    limitHint: '每页最多 1000 条，翻页仅保留当前页。',
+    limitHint: '默认 200 条（每条约 0.7KB）。日志量很大时先收窄时间范围或加过滤条件，比调大每页条数更有效。',
     rangeInvalid: '请选择有效的起止时间',
     queryFailed: '查询失败',
   },
diff --git a/frontend/src/pages/logs/components/LogContextDialog.tsx b/frontend/src/pages/logs/components/LogContextDialog.tsx
index 4312dc5..921ecc9 100644
--- a/frontend/src/pages/logs/components/LogContextDialog.tsx
+++ b/frontend/src/pages/logs/components/LogContextDialog.tsx
@@ -41,7 +41,7 @@ export function LogContextDialog({ context, terms, lines, onLinesChange, onClose
             <Select value={String(lines)} onValueChange={value => onLinesChange(Number(value))}>
               <SelectTrigger className="h-6 w-16 px-2 text-xs"><SelectValue /></SelectTrigger>
               <SelectContent>
-                {[2, 5, 10, 20, 50].map(value => <SelectItem key={value} value={String(value)}>{value}</SelectItem>)}
+                {[1, 2, 5, 10, 20, 50].map(value => <SelectItem key={value} value={String(value)}>{value}</SelectItem>)}
               </SelectContent>
             </Select>
           </span>
diff --git a/frontend/src/pages/logs/index.tsx b/frontend/src/pages/logs/index.tsx
index 3ea23fe..e9924e5 100644
--- a/frontend/src/pages/logs/index.tsx
+++ b/frontend/src/pages/logs/index.tsx
@@ -68,7 +68,9 @@ export default function LogsPage() {
   const [executedRange, setExecutedRange] = useState<{ start: number; end: number } | null>(null)
   const [start, setStart] = useState(() => toLocal(new Date(Date.now() - 300000)))
   const [end, setEnd] = useState(() => toLocal(new Date()))
-  const [limit, setLimit] = useState(1000)
+  // 默认 200：实测 671B/条，200 条约 131KB、DOM 200 行渲染顺畅。
+  // 后端 maxLogQueryLimit=1000，所以下拉不给 2000/5000（否则静默截断成 1000，是假选项）
+  const [limit, setLimit] = useState(200)
   const [queryHistory, setQueryHistory] = useState(readQueryHistory)
   const [entries, setEntries] = useState<LogEntry[]>([])
   const [searched, setSearched] = useState(false)
@@ -198,10 +200,10 @@ export default function LogsPage() {
     return () => window.clearInterval(timer)
   }, [tail, sourceId, query, limit])
 
-  /** 上下文前后条数：默认 2 条（原来写死 5），选择后记住，弹窗内可随时改 */
+  /** 上下文前后条数：默认 5 条（Java 一个异常常拆成 4 条日志，2 条拼不完整），选择后记住 */
   const [contextLines, setContextLines] = useState<number>(() => {
     const saved = Number(localStorage.getItem('logContextLines'))
-    return saved > 0 && saved <= 50 ? saved : 2
+    return saved > 0 && saved <= 50 ? saved : 5
   })
   /** 记住当前查看上下文的那一行，切换条数时原地重新拉取 */
   const [contextRow, setContextRow] = useState<LogEntry | null>(null)
@@ -273,7 +275,7 @@ export default function LogsPage() {
             <Select value={String(limit)} onValueChange={value => setLimit(Number(value))}>
               <SelectTrigger className="h-9 w-24" aria-label={t('toolbar.limitLabel')}><SelectValue /></SelectTrigger>
               <SelectContent>
-                {[100, 500, 1000, 2000, 5000].map(value => <SelectItem key={value} value={String(value)}>{value}</SelectItem>)}
+                {[100, 200, 500, 1000].map(value => <SelectItem key={value} value={String(value)}>{value}</SelectItem>)}
               </SelectContent>
             </Select>
           </label>