diff --git a/src/core/index.js b/src/core/index.js
index 1cf240cc..677e3786 100644
--- a/src/core/index.js
+++ b/src/core/index.js
@@ -6,10 +6,6 @@ import AllPlugins from "./plugins/all"
 import { parseSearch } from "./utils"
 import win from "./window"
 
-if (process.env.NODE_ENV !== "production" && typeof window !== "undefined") {
-  win.Perf = require("react-dom/lib/ReactPerf")
-}
-
 // eslint-disable-next-line no-undef
 const { GIT_DIRTY, GIT_COMMIT, PACKAGE_VERSION, BUILD_TIME } = buildInfo