diff --git a/frontend/lib/fileSender.ts b/frontend/lib/fileSender.ts
index d9d8259..31ef59a 100644
--- a/frontend/lib/fileSender.ts
+++ b/frontend/lib/fileSender.ts
@@ -22,7 +22,6 @@ class FileSender {
   private webrtcConnection: WebRTC_Initiator;
   private peerStates: Map<string, PeerState>;
   private readonly chunkSize: number;
-  private readonly maxBufferSize: number;
   private pendingFiles: Map<string, CustomFile>;
   private pendingFolerMeta: Record<string, FolderMeta>;
   private speedCalculator: SpeedCalculator;
@@ -33,7 +32,6 @@ class FileSender {
     BATCH_SIZE: 8, // 8块批量 - 32MB批次处理成功
     NETWORK_CHUNK_SIZE: 65536, // 64KB - WebRTC安全发送大小，修复sendData failed
     BUFFER_THRESHOLD: 3145728, // 3MB - 提升缓冲区阈值匹配大块处理
-    MAX_BUFFER_SIZE: 3, // 3块预读缓冲 - 平衡内存和性能
     BACKPRESSURE_TIMEOUT: 2000, // 2秒超时 - 为大块处理预留更多时间
   } as const;
 
@@ -45,7 +43,6 @@ class FileSender {
 
     // 统一使用优化参数 - 所有设备共享最佳配置
     this.chunkSize = FileSender.OPTIMIZED_CONFIG.CHUNK_SIZE;
-    this.maxBufferSize = FileSender.OPTIMIZED_CONFIG.MAX_BUFFER_SIZE;
     this.pendingFiles = new Map(); // All files pending to be sent (by reference) {fileId: CustomFile}
 
     this.pendingFolerMeta = {}; // Metadata for folders (total size, total file count), used for tracking transfer progress
diff --git a/frontend/lib/webrtc_base.ts b/frontend/lib/webrtc_base.ts
index 7e80aad..3f576e9 100644
--- a/frontend/lib/webrtc_base.ts
+++ b/frontend/lib/webrtc_base.ts
@@ -439,18 +439,19 @@ export default class BaseWebRTC {
     }
 
     this.log("warn", `Data channel not ready for peer ${peerId}. Retrying...`);
-    this.retryDataSend(data, peerId);
-    return false;
+    return this.retryDataSend(data, peerId);
   }
 
-  protected retryDataSend(data: any, peerId: string): void {
+  protected retryDataSend(data: any, peerId: string): boolean {
     const maxRetries = 5;
     let retryCount = 0;
+    let ret = false;
 
     const attemptSend = () => {
       const dataChannel = this.dataChannels.get(peerId);
       if (dataChannel?.readyState === "open") {
         dataChannel.send(data);
+        ret = true;
       } else if (retryCount < maxRetries) {
         retryCount++;
         this.log(
@@ -466,6 +467,7 @@ export default class BaseWebRTC {
     };
 
     setTimeout(attemptSend, 100);
+    return ret;
   }
 
   protected async closeDataChannel(peerId: string): Promise<void> {