diff --git a/package-lock.json b/package-lock.json
index c7cf27d..6cc8ed4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4639,11 +4639,6 @@
         "object-visit": "1.0.1"
       }
     },
-    "marky": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/marky/-/marky-1.2.0.tgz",
-      "integrity": "sha1-lhftZHu76o9F0ZUm2jPexwYG30I="
-    },
     "math-expression-evaluator": {
       "version": "1.2.17",
       "resolved": "https://registry.npmjs.org/math-expression-evaluator/-/math-expression-evaluator-1.2.17.tgz",
diff --git a/package.json b/package.json
index 41fd4cb..35459d3 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,6 @@
     "intl-relativeformat": "^2.1.0",
     "lodash": "^4.17.4",
     "lodash-webpack-plugin": "^0.11.4",
-    "marky": "^1.2.0",
     "node-fetch": "^1.7.3",
     "node-sass": "^4.7.2",
     "npm-run-all": "^4.1.2",
diff --git a/routes/_utils/marks.js b/routes/_utils/marks.js
index dc2658e..f354db6 100644
--- a/routes/_utils/marks.js
+++ b/routes/_utils/marks.js
@@ -1,12 +1,23 @@
-import { mark as markyMark, stop as markyStop } from 'marky'
 import noop from 'lodash/noop'
 
 const enableMarks = process.browser &&
+  performance.mark &&
   (process.env.NODE_ENV !== 'production' ||
   new URLSearchParams(location.search).get('marks') === 'true')
 
-const mark = enableMarks ? markyMark : noop
-const stop = enableMarks ? markyStop : noop
+const perf = process.browser && performance
+
+function doMark(name) {
+  perf.mark(`start ${name}`)
+}
+
+function doStop(name) {
+  perf.mark(`end ${name}`)
+  perf.measure(name, `start ${name}`, `end ${name}`)
+}
+
+const mark = enableMarks ? doMark : noop
+const stop = enableMarks ? doStop : noop
 
 export {
   mark,