nodejs
diff --git a/Collapse file
‎deps/v8/src/elements.cc‎
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+11-6Lines changed: 11 additions & 6 deletions b/Collapse file
‎deps/v8/src/elements.cc‎
Copy file name to clipboardExpand all lines: deps/v8/src/elements.cc
+11-6Lines changed: 11 additions & 6 deletions
diff --git a/Collapse file
‎deps/v8/src/objects.cc‎
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+2Lines changed: 2 additions & 0 deletions b/Collapse file
‎deps/v8/src/objects.cc‎
Copy file name to clipboardExpand all lines: deps/v8/src/objects.cc
+2Lines changed: 2 additions & 0 deletions
@@ -1071,13 +1071,18 @@ class FastElementsAccessor
       }
       int num_used = 0;
       for (int i = 0; i < backing_store->length(); ++i) {
-        if (!backing_store->is_the_hole(i)) ++num_used;
-        // Bail out early if more than 1/4 is used.
-        if (4 * num_used > backing_store->length()) break;
-      }
-      if (4 * num_used <= backing_store->length()) {
-        JSObject::NormalizeElements(obj);
+        if (!backing_store->is_the_hole(i)) {
+          ++num_used;
+          // Bail out if a number dictionary wouldn't be able to save at least
+          // 75% space.
+          if (4 * SeededNumberDictionary::ComputeCapacity(num_used) *
+                  SeededNumberDictionary::kEntrySize >
+              backing_store->length()) {
+            return;
+          }
+        }
       }
+      JSObject::NormalizeElements(obj);
     }
   }
 
 
@@ -12226,6 +12226,8 @@ static bool ShouldConvertToFastElements(JSObject* object,
 
   uint32_t dictionary_size = static_cast<uint32_t>(dictionary->Capacity()) *
                              SeededNumberDictionary::kEntrySize;
+
+  // Turn fast if the dictionary only saves 50% space.
   return 2 * dictionary_size >= *new_capacity;
 }
Original file line number	Diff line number	Diff line change
`@@ -12226,6 +12226,8 @@ static bool ShouldConvertToFastElements(JSObject* object,`
`12226`	`12226`
`12227`	`12227`	`uint32_t dictionary_size = static_cast<uint32_t>(dictionary->Capacity()) *`
`12228`	`12228`	`SeededNumberDictionary::kEntrySize;`
	`12229`	`+`
	`12230`	`+ // Turn fast if the dictionary only saves 50% space.`
`12229`	`12231`	`return 2 * dictionary_size >= *new_capacity;`
`12230`	`12232`	`}`
`12231`	`12233`