diff --git a/lib/chunk-upload.ts b/lib/chunk-upload.ts
index 80cc353..493357f 100644
--- a/lib/chunk-upload.ts
+++ b/lib/chunk-upload.ts
@@ -405,7 +405,11 @@ export async function chunkUpload(
     const timeDelta = (currentTime - lastUpdateTime) / 1000 // 秒
     const bytesDelta = clampedBytes - lastUploadedBytes
 
-    if (timeDelta > 0.1) {
+    // 优化：降低速度显示更新频率，从0.1秒改为1秒
+    // 避免速度数字跳动过快，用户无法看清
+    const UPDATE_INTERVAL = 1 // 1秒更新一次
+
+    if (timeDelta >= UPDATE_INTERVAL) {
       const currentSpeed = bytesDelta / timeDelta
 
       if (currentSpeed > 0 && currentSpeed < file.size * 100) {
@@ -425,6 +429,7 @@ export async function chunkUpload(
       lastUpdateTime = currentTime
       lastUploadedBytes = clampedBytes
     } else {
+      // 在更新间隔内，使用上一次的速度显示（避免数字跳动）
       if (speedHistory.length > 0) {
         const lastSpeed = speedHistory[speedHistory.length - 1]
         onProgress?.(progress, lastSpeed)