fix(NODE-7307): Replace node:process.hrtime() with performance.now()

src/utils.ts

@@ -436,8 +436,7 @@ export function makeStateMachine(stateTable: StateTable): StateTransitionFunctio
 
 /** @internal */
 export function now(): number {
-  const hrtime = process.hrtime();
-  return Math.floor(hrtime[0] * 1000 + hrtime[1] / 1000000);
+  return Math.floor(performance.now());
 }
 
 /** @internal */

test/unit/utils.test.ts

@@ -21,6 +21,7 @@ import {
   List,
   MongoDBCollectionNamespace,
   MongoDBNamespace,
+  now,
   shuffle
 } from '../../src/utils';
 import { sleep } from '../tools/utils';
@@ -1285,4 +1286,15 @@ describe('driver utils', function () {
       });
     });
   });
+
+  describe('now()', () => {
+    it('difference between two calls is close to sleep time', async () => {
+      const time1 = now();
+      await sleep(10);
+      const time2 = now();
+      const diff = time2 - time1;
+      expect(diff).to.be.gte(5);
+      expect(diff).to.be.lte(15);
+    });
+  });
 });