diff --git a/.gitignore b/.gitignore
index 02e9ad75..fff04f0c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,5 +5,7 @@ thirdparty/
 tritoin/
 CMakeFiles/
 logs/
+doc/data/
+doc/images/
 QWEN.md
 CMakeCache.txt
diff --git a/src/workspace/Timestep.cpp b/src/workspace/Timestep.cpp
index fff2408c..43cec0fd 100644
--- a/src/workspace/Timestep.cpp
+++ b/src/workspace/Timestep.cpp
@@ -95,11 +95,7 @@ void Timestep::Start() {
         return;
     }
     workSpace_->Begin();
-    // 重置速度为 1x 并通知 UI
-    auto it = std::find(speedLevels_.begin(), speedLevels_.end(), 1.0);
-    speedIndex_ = it != speedLevels_.end() ? int(std::distance(speedLevels_.begin(), it)) : speedIndex_;
-    currentStep_ = speedLevels_[speedIndex_];
-    emit StepChanged(currentStep_);
+    // 保持当前倍速，不在开始时重置为 1x
     emit StatusChanged((int)playStatus_);
 }