diff --git a/src/virtual-machine.js b/src/virtual-machine.js
index 30e809b6d..131c421c2 100644
--- a/src/virtual-machine.js
+++ b/src/virtual-machine.js
@@ -478,6 +478,9 @@ class VirtualMachine extends EventEmitter {
         // Clear the current runtime
         this.clear();
 
+        if (typeof performance !== 'undefined') {
+            performance.mark('scratch-vm-deserialize-start');
+        }
         const runtime = this.runtime;
         const deserializePromise = function () {
             const projectVersion = projectJSON.projectVersion;
@@ -492,8 +495,14 @@ class VirtualMachine extends EventEmitter {
             return Promise.reject('Unable to verify Scratch Project version.');
         };
         return deserializePromise()
-            .then(({targets, extensions}) =>
-                this.installTargets(targets, extensions, true));
+            .then(({targets, extensions}) => {
+                if (typeof performance !== 'undefined') {
+                    performance.mark('scratch-vm-deserialize-end');
+                    performance.measure('scratch-vm-deserialize',
+                        'scratch-vm-deserialize-start', 'scratch-vm-deserialize-end');
+                }
+                return this.installTargets(targets, extensions, true);
+            });
     }
 
     /**