diff --git a/CLAUDE.md b/CLAUDE.md
index 630cb30e..2ee6b111 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -891,7 +891,10 @@ iPhone 上每次都退出重进测就碰不到，要复现就同页连开两场
 译文音频是模型**突发**产出的（每 3~6 秒一段文本，音频一次性到），播放只能 1 倍速；说话人不停顿时
 译文时长 ≈ 原话时长（实测 A 路 133 秒会话产出 129 秒音频），下行队列只涨不缩——A 路积压到 **6.2 秒**，
 用户说的"越说越慢"就是它。**上行没有积压**（桥峰值 8~12 帧），瓶颈只在 `CallTranslationDownlink`。
-处理两层，都不丢内容：积压 >1s 裁掉超过 150ms 的静音；>2s 起 WSOLA 变速不变调，4s 达 1.3x 上限。
+处理两层，都不丢内容：积压 >0.5s 裁掉超过 150ms 的静音；>1s 起 WSOLA 变速不变调，2.5s 达 1.3x 上限
+（2026-09-22 晚由 1s/2s/4s 收紧而来：同一份到达轨迹回放对比，>3s 积压的累计时长减半、中位降 25%；
+峰值不再随参数下降——峰值由云端单次响应的音频长度决定，一句不换气说 28 秒就会砸下 8 秒音频，
+再往下只能从切句下手，如 `turn_detection`。1.5x 上限能再减 40% 的 >2s 时长，但语速发急，作为口味项未采用）。
 同量压测：最大积压 6.2s → 3.2s，绝大部分时间 <1.5s，**光裁静音就省了 10%**（TTS 句间停顿），
 变速最高只用到 1.11x。兜底整段丢弃（`HARD_CAP_SEC`）默认关。
 - 参数与算法两端一份（`CallTranslationDownlink.kt` / `.swift`），改一端要同改另一端；
diff --git a/apps/client/local_plugins/bluetooth_manager/android/src/main/kotlin/com/example/bluetooth_manager/CallTranslationDownlink.kt b/apps/client/local_plugins/bluetooth_manager/android/src/main/kotlin/com/example/bluetooth_manager/CallTranslationDownlink.kt
index e92e03a4..7216e4a5 100644
--- a/apps/client/local_plugins/bluetooth_manager/android/src/main/kotlin/com/example/bluetooth_manager/CallTranslationDownlink.kt
+++ b/apps/client/local_plugins/bluetooth_manager/android/src/main/kotlin/com/example/bluetooth_manager/CallTranslationDownlink.kt
@@ -59,10 +59,10 @@ object CallTranslationDownlink {
   private const val PACKET_SIZE = 84
 
   // ---- 追赶策略参数 ----
-  private const val CATCHUP_START_SEC = 2.0
-  private const val CATCHUP_FULL_SEC = 4.0
+  private const val CATCHUP_START_SEC = 1.0
+  private const val CATCHUP_FULL_SEC = 2.5
   private const val MAX_RATE = 1.3
-  private const val SILENCE_TRIM_START_SEC = 1.0
+  private const val SILENCE_TRIM_START_SEC = 0.5
   private const val SILENCE_KEEP_MS = 150
   private const val SILENCE_RMS = 300.0
   private const val HARD_CAP_SEC = 0.0
diff --git a/apps/client/local_plugins/bluetooth_manager/ios/bluetooth_manager/Sources/bluetooth_manager/CallTranslationDownlink.swift b/apps/client/local_plugins/bluetooth_manager/ios/bluetooth_manager/Sources/bluetooth_manager/CallTranslationDownlink.swift
index bc720777..a54aa3fd 100644
--- a/apps/client/local_plugins/bluetooth_manager/ios/bluetooth_manager/Sources/bluetooth_manager/CallTranslationDownlink.swift
+++ b/apps/client/local_plugins/bluetooth_manager/ios/bluetooth_manager/Sources/bluetooth_manager/CallTranslationDownlink.swift
@@ -38,10 +38,10 @@ public final class CallTranslationDownlink {
     private static let packetSize = 84
 
     // ---- 追赶策略参数（与 Android 一致，改一端要同改另一端）----
-    private static let catchupStartSec = 2.0
-    private static let catchupFullSec = 4.0
+    private static let catchupStartSec = 1.0
+    private static let catchupFullSec = 2.5
     private static let maxRate = 1.3
-    private static let silenceTrimStartSec = 1.0
+    private static let silenceTrimStartSec = 0.5
     private static let silenceKeepMs = 150
     private static let silenceRms = 300.0
     private static let hardCapSec = 0.0