benchmark: test performance cost of re-creating schema (#3596)

Author: IvanGoncharov

benchmark/GraphQLSchema-benchmark.js

@@ -0,0 +1,15 @@
+import { GraphQLSchema } from 'graphql/type/schema.js';
+import { buildClientSchema } from 'graphql/utilities/buildClientSchema.js';
+
+import { bigSchemaIntrospectionResult } from './fixtures.js';
+
+const bigSchema = buildClientSchema(bigSchemaIntrospectionResult.data);
+
+export const benchmark = {
+  name: 'Recreate a GraphQLSchema',
+  count: 40,
+  measure() {
+    // eslint-disable-next-line no-new
+    new GraphQLSchema(bigSchema.toConfig());
+  },
+};