benchmark: add async object field benchmark (#4690)

Author: yaacovCR

benchmark/object-async-benchmark.js

@@ -0,0 +1,32 @@
+import { execute } from 'graphql/execution/execute.js';
+import { parse } from 'graphql/language/parser.js';
+import { buildSchema } from 'graphql/utilities/buildASTSchema.js';
+
+const fieldCount = 1000;
+const fieldNames = Array.from(
+  { length: fieldCount },
+  (_, index) => `f${index}`,
+);
+
+const schema = buildSchema(
+  `type Query { ${fieldNames.map((fieldName) => `${fieldName}: Int`).join(' ')} }`,
+);
+
+const document = parse(`{ ${fieldNames.join(' ')} }`);
+
+const rootValue = Object.fromEntries(
+  fieldNames.map((fieldName, index) => [
+    fieldName,
+    () => Promise.resolve(index),
+  ]),
+);
+
+export const benchmark = {
+  name: 'Execute Asynchronous Fields',
+  measure: () =>
+    execute({
+      schema,
+      document,
+      rootValue,
+    }),
+};