Start with a more conservative initial old generation size.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 15eb0820f038e1b3ac23e4f3d341cc9a540cb7b9..23d634001b1a8ce2b2594fbf62c957d2f85f860c 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1084,6 +1084,8 @@ class Heap {
   static const intptr_t kMinimumOldGenerationAllocationLimit =
       8 * (Page::kPageSize > MB ? Page::kPageSize : MB);
 
+  static const int kInitalOldGenerationLimitFactor = 7;
+
   static const int kPointerMultiplier = i::kPointerSize / 4;
 
   // The new space size has to be a power of 2. Sizes are in MB.