diff --git a/Runtime/MP1/MP1.cpp b/Runtime/MP1/MP1.cpp
index ee5eb0094..ac4a6bf10 100644
--- a/Runtime/MP1/MP1.cpp
+++ b/Runtime/MP1/MP1.cpp
@@ -844,7 +844,7 @@ bool CMain::Proc() {
     m_firstFrame = false;
   } else {
     using delta_duration = std::chrono::duration<float, std::ratio<1>>;
-    dt = std::min(std::chrono::duration_cast<delta_duration>(now - m_prevFrameTime).count(), dt);
+    dt = std::min(std::chrono::duration_cast<delta_duration>(now - m_prevFrameTime).count(), 1 / 30.f);
   }
   m_prevFrameTime = now;
 #endif
diff --git a/Runtime/MP1/MP1.hpp b/Runtime/MP1/MP1.hpp
index eea752799..62eb6d958 100644
--- a/Runtime/MP1/MP1.hpp
+++ b/Runtime/MP1/MP1.hpp
@@ -4,7 +4,7 @@
 #define MP1_USE_BOO 0
 #endif
 #ifndef MP1_VARIABLE_DELTA_TIME
-#define MP1_VARIABLE_DELTA_TIME 1
+#define MP1_VARIABLE_DELTA_TIME 0
 #endif
 
 #include "IMain.hpp"
diff --git a/hecl b/hecl
index f64ed44fe..29c768f82 160000
--- a/hecl
+++ b/hecl
@@ -1 +1 @@
-Subproject commit f64ed44fe8164b06ed5bef6344d9f743e2c5d638
+Subproject commit 29c768f8231fac3b1c6812829faa42457e98b47f