diff --git a/src/components/GanttLinks.vue b/src/components/GanttLinks.vue
index fa99e48..0fa62bc 100644
--- a/src/components/GanttLinks.vue
+++ b/src/components/GanttLinks.vue
@@ -2,6 +2,7 @@
 import { ref, watch, nextTick, onMounted, computed } from 'vue'
 import type { Task } from '../models/classes/Task'
 import { getPredecessorIds } from '../utils/predecessorUtils'
+// import { perfMonitor } from '../utils/perfMonitor'
 
 // 定义 TaskBar 位置信息类型
 interface TaskBarPosition {
@@ -49,6 +50,8 @@ const isDarkTheme = computed(() => {
  * 性能优势：相比 SVG 提升 18 倍渲染性能
  */
 const drawLinks = () => {
+  // const startTime = performance.now()
+
   const canvas = canvasRef.value
   if (!canvas) return
 
@@ -78,13 +81,13 @@ const drawLinks = () => {
     ctx.strokeStyle = lineColor
     ctx.lineWidth = 1
 
-    // 绘制每条垂直线
+    // 优化：一次性绘制所有垂直线，避免多次 stroke() 调用
+    ctx.beginPath()
     for (const line of props.verticalLines) {
-      ctx.beginPath()
       ctx.moveTo(line.left, 0)
       ctx.lineTo(line.left, rect.height)
-      ctx.stroke()
     }
+    ctx.stroke()
 
     ctx.restore()
   }
@@ -179,6 +182,16 @@ const drawLinks = () => {
       ctx.globalAlpha = 1
     }
   }
+
+  // 性能监控
+  // const endTime = performance.now()
+  // const duration = endTime - startTime
+  // perfMonitor.log('Canvas 重绘', {
+  //   耗时: `${duration.toFixed(2)}ms`,
+  //   关系线数量: props.tasks.filter(t => t.predecessor).length,
+  //   垂直线数量: props.verticalLines?.length || 0,
+  //   Canvas尺寸: `${rect.width}x${rect.height}`,
+  // })
 }
 
 /**
@@ -224,8 +237,24 @@ watch(
     () => props.hoveredTaskId,
     () => props.width,
     () => props.height,
+    () => props.verticalLines,
+    () => props.showVerticalLines,
   ],
-  () => {
+  (newVals, oldVals) => {
+    // 记录是什么触发了重绘
+    // const changes: string[] = []
+    // if (newVals[0] !== oldVals[0]) changes.push('taskBarPositions')
+    // if (newVals[1] !== oldVals[1]) changes.push('tasks.length')
+    // if (newVals[2] !== oldVals[2]) changes.push('highlightedTaskId')
+    // if (newVals[3] !== oldVals[3]) changes.push('highlightedTaskIds')
+    // if (newVals[4] !== oldVals[4]) changes.push('hoveredTaskId')
+    // if (newVals[5] !== oldVals[5]) changes.push('width')
+    // if (newVals[6] !== oldVals[6]) changes.push('height')
+    // if (newVals[7] !== oldVals[7]) changes.push('verticalLines')
+    // if (newVals[8] !== oldVals[8]) changes.push('showVerticalLines')
+
+    // perfMonitor.log('Canvas 触发重绘', { 变化属性: changes.join(', ') })
+
     nextTick(() => {
       drawLinks()
     })
diff --git a/src/components/Timeline.vue b/src/components/Timeline.vue
index 66f6f52..159aff4 100644
--- a/src/components/Timeline.vue
+++ b/src/components/Timeline.vue
@@ -1019,8 +1019,8 @@ const handleTimelineContainerResized = () => {
 
 // 处理任务行悬停事件
 const handleTaskRowHover = (taskId: number | null) => {
-  // 如果正在拖拽Splitter，则不响应悬停事件
-  if (isSplitterDragging.value) {
+  // 如果正在拖拽Splitter或拖动滚动，则不响应悬停事件
+  if (isSplitterDragging.value || isDragging.value) {
     return
   }
 
@@ -1047,6 +1047,10 @@ const contentHeight = computed(() => {
 
 // 监听TaskList的悬停事件
 const handleTaskListHover = (event: CustomEvent) => {
+  // 如果正在拖动滚动，则不响应悬停事件
+  if (isDragging.value) {
+    return
+  }
   hoveredTaskId.value = event.detail
 }
 
@@ -2341,6 +2345,9 @@ const handleMouseUp = () => {
     timelineContainer.value.style.userSelect = 'auto'
   }
 
+  // 清空 hover 状态，避免拖动结束后立即触发 hover 重绘
+  hoveredTaskId.value = null
+
   // 移除全局事件监听器
   document.removeEventListener('mousemove', handleMouseMove)
   document.removeEventListener('mouseup', handleMouseUp)
diff --git a/src/utils/perfMonitor.ts b/src/utils/perfMonitor.ts
new file mode 100644
index 0000000..d0f935b
--- /dev/null
+++ b/src/utils/perfMonitor.ts
@@ -0,0 +1,40 @@
+/**
+ * 性能监控工具
+ */
+
+let lastLogTime = 0
+const LOG_THROTTLE = 100 // 最多每 100ms 输出一次日志
+
+export const perfMonitor = {
+  /**
+   * 记录性能日志（自动节流）
+   */
+  log(tag: string, data: unknown) {
+    const now = Date.now()
+    if (now - lastLogTime < LOG_THROTTLE) {
+      return
+    }
+    lastLogTime = now
+
+    // eslint-disable-next-line no-console
+    console.log(`[Perf] ${tag}:`, data)
+  },
+
+  /**
+   * 测量函数执行时间
+   */
+  measure<T>(tag: string, fn: () => T): T {
+    const start = performance.now()
+    const result = fn()
+    const end = performance.now()
+    const duration = end - start
+
+    if (duration > 5) {
+      // 只记录耗时超过 5ms 的操作
+      // eslint-disable-next-line no-console
+      console.log(`[Perf] ${tag}: ${duration.toFixed(2)}ms`)
+    }
+
+    return result
+  },
+}