Remove The performance hazards of [[Prototype]] mutation page (mdn#20018)

Author: Josh-Cena

files/en-us/_redirects.txt

@@ -12251,7 +12251,8 @@
 /en-US/docs/Web/JavaScript/Reference/rest_parameters	/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters
 /en-US/docs/Web/JavaScript/Reference/template_strings	/en-US/docs/Web/JavaScript/Reference/Template_literals
 /en-US/docs/Web/JavaScript/Same_origin_policy_for_JavaScript	/en-US/docs/Web/Security/Same-origin_policy
-/en-US/docs/Web/JavaScript/The_performance_hazards_of__[[Prototype]]_mutation	/en-US/docs/Web/JavaScript/The_performance_hazards_of_prototype_mutation
+/en-US/docs/Web/JavaScript/The_performance_hazards_of__[[Prototype]]_mutation	/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
+/en-US/docs/Web/JavaScript/The_performance_hazards_of_prototype_mutation	/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
 /en-US/docs/Web/JavaScript/Tutorials	/en-US/docs/Web/JavaScript
 /en-US/docs/Web/JavaScript/Typed_arrays/ArrayBuffer	/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer
 /en-US/docs/Web/JavaScript/Typed_arrays/ArrayBufferView	/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray

files/en-us/_wikihistory.json

@@ -127162,10 +127162,6 @@
       "Hamstersoup"
     ]
   },
-  "Web/JavaScript/The_performance_hazards_of_prototype_mutation": {
-    "modified": "2020-04-30T10:28:18.041Z",
-    "contributors": ["fscholz", "Waldo"]
-  },
   "Web/JavaScript/Typed_arrays": {
     "modified": "2020-10-15T21:04:01.905Z",
     "contributors": [

files/en-us/web/javascript/reference/global_objects/object/proto/index.md

@@ -13,7 +13,7 @@ browser-compat: javascript.builtins.Object.proto
 ---
 {{JSRef}}{{Deprecated_header}}
 
-> **Warning:** Changing the `[[Prototype]]` of an object is, by the nature of [how modern JavaScript engines optimize property accesses](https://mathiasbynens.be/notes/prototypes), currently a very slow operation in every browser and JavaScript engine. In addition, the effects of altering inheritance are subtle and far-flung, and are not limited to the time spent in the `Object.setPrototypeOf(...)` statement, but may extend to **_any_** code that has access to any object whose `[[Prototype]]` has been altered. You can read more in [The performance hazards of [[Prototype]] mutation](/en-US/docs/Web/JavaScript/The_performance_hazards_of_prototype_mutation).
+> **Warning:** Changing the `[[Prototype]]` of an object is, by the nature of how modern JavaScript engines optimize property accesses, currently a very slow operation in every browser and JavaScript engine. In addition, the effects of altering inheritance are subtle and far-flung, and are not limited to the time spent in the `obj.__proto__ = ...` statement, but may extend to **_any_** code that has access to any object whose `[[Prototype]]` has been altered. You can read more in [JavaScript engine fundamentals: optimizing prototypes](https://mathiasbynens.be/notes/prototypes).
 
 > **Warning:** While `Object.prototype.__proto__` is supported today in most browsers, its existence and exact behavior has only been standardized as a legacy feature to ensure compatibility for web browsers. For better support, use {{JSxRef("Object.getPrototypeOf()")}} and {{JSxRef("Object.setPrototypeOf()")}} instead.
 

files/en-us/web/javascript/reference/global_objects/object/setprototypeof/index.md

@@ -13,7 +13,7 @@ browser-compat: javascript.builtins.Object.setPrototypeOf
 
 The **`Object.setPrototypeOf()`** method sets the prototype (i.e., the internal `[[Prototype]]` property) of a specified object to another object or [`null`](/en-US/docs/Web/JavaScript/Reference/Operators/null).
 
-> **Warning:** Changing the `[[Prototype]]` of an object is, by the nature of [how modern JavaScript engines optimize property accesses](https://mathiasbynens.be/notes/prototypes), currently a very slow operation in every browser and JavaScript engine. In addition, the effects of altering inheritance are subtle and far-flung, and are not limited to the time spent in the `Object.setPrototypeOf(...)` statement, but may extend to **_any_** code that has access to any object whose `[[Prototype]]` has been altered. You can read more in [The performance hazards of [[Prototype]] mutation](/en-US/docs/Web/JavaScript/The_performance_hazards_of_prototype_mutation).
+> **Warning:** Changing the `[[Prototype]]` of an object is, by the nature of how modern JavaScript engines optimize property accesses, currently a very slow operation in every browser and JavaScript engine. In addition, the effects of altering inheritance are subtle and far-flung, and are not limited to the time spent in the `Object.setPrototypeOf(...)` statement, but may extend to **_any_** code that has access to any object whose `[[Prototype]]` has been altered. You can read more in [JavaScript engine fundamentals: optimizing prototypes](https://mathiasbynens.be/notes/prototypes).
 >
 > Because this feature is a part of the language, it is still the burden on engine developers to implement that feature performantly (ideally). Until engine developers address this issue, if you are concerned about performance, you should avoid setting the `[[Prototype]]` of an object. Instead, create a new object with the desired `[[Prototype]]` using {{jsxref("Object.create()")}}.