UI freezes / lags / halts when when navigating to a new screen that contains a webview (iOS)

[arifje]

• [v] I have read the Getting Started section
• [v] I have already searched for the same problem

Environment

Technology	Version
Flutter version	3.10.3
Plugin version	5.7.2+3
Android version	x
iOS version	14.2
macOS version	13.1
Xcode version	14.2

Device information: all iOS simulators & real device

Description

Navigating to a new screen that contains a webview causes a weird lag/delay/freeze. The UI freezes now and then, when the webview is initialised, so animation of the screen is sometimes skipped too.

Screencast:

https://github.com/pichillilorenzo/flutter_inappwebview/assets/1286410/620a7df9-a3c9-408e-ae33-1528bba0b646

Current behavior:

A normal screen animates smooth, but a screen with the webview freezes, lags after clicking the button.

Steps to reproduce

Code example:

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('home'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            MaterialButton(
              color: Colors.blue,
              onPressed: () {
                Navigator.push(context,
                    CupertinoPageRoute(builder: (_) => const MyHomePage()));
              },
              child: const Text('home'),
            ),
            MaterialButton(
              color: Colors.blue,
              onPressed: () {
                Navigator.push(context,
                    CupertinoPageRoute(builder: (_) => const WebViewPage()));
              },
              child: const Text('navigate to webview'),
            )
          ],
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

class WebViewPage extends StatelessWidget {
  const WebViewPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('web page'),
      ),
      body: InAppWebView(
        initialUrlRequest: URLRequest(url: Uri.parse('https://flutter.dev/')),
      ),
    );
  }
}

EDIT: I also tested it with latest xcode 14.3.1 and flutter_inappwebview 6.X.X, same issue.