[jss] Add a benchmark for creating jss instances (#928)

* Add a new benchmark for comparing creating instances with the preset and without it

* Improve suite name

packages/jss/benchmark/tests/create-instance.js

@@ -0,0 +1,18 @@
+import {create} from 'jss'
+import preset from 'jss-preset-default'
+
+// Avoid memory leak with registry.
+const options = {virtual: true}
+
+suite('create a new instance', () => {
+  benchmark('without preset', () => {
+    create(options)
+  })
+
+  benchmark('with preset', () => {
+    create({
+      ...options,
+      ...preset()
+    })
+  })
+})