{"action":"opened","issue":{"url":"https://api.github.com/repos/zloirock/core-js/issues/46","labels_url":"https://api.github.com/repos/zloirock/core-js/issues/46/labels{/name}","comments_url":"https://api.github.com/repos/zloirock/core-js/issues/46/comments","events_url":"https://api.github.com/repos/zloirock/core-js/issues/46/events","html_url":"https://github.com/zloirock/core-js/issues/46","id":64824218,"number":46,"title":"Code too slow because of \"mutating the [[Prototype]] of an object [..]\" error ","user":{"login":"pindamonhangaba","id":1778376,"avatar_url":"https://avatars.githubusercontent.com/u/1778376?v=3","gravatar_id":"","url":"https://api.github.com/users/pindamonhangaba","html_url":"https://github.com/pindamonhangaba","followers_url":"https://api.github.com/users/pindamonhangaba/followers","following_url":"https://api.github.com/users/pindamonhangaba/following{/other_user}","gists_url":"https://api.github.com/users/pindamonhangaba/gists{/gist_id}","starred_url":"https://api.github.com/users/pindamonhangaba/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pindamonhangaba/subscriptions","organizations_url":"https://api.github.com/users/pindamonhangaba/orgs","repos_url":"https://api.github.com/users/pindamonhangaba/repos","events_url":"https://api.github.com/users/pindamonhangaba/events{/privacy}","received_events_url":"https://api.github.com/users/pindamonhangaba/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-03-27T18:30:16Z","updated_at":"2015-03-27T18:30:16Z","closed_at":null,"body":"Using babel/browser-polyfill.js my app gets so slow it momentarily makes firefox not respond, with the warning:\r\n     \r\n    mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create\r\n\r\nFrom https://github.com/babel/babel/issues/1099"}}