SfSignaturePad: extremely bad performance in iOS after upgrading Flutter version

[gabrielbertollo]

The SfSignaturePad widget started performing very badly on iOS devices, seemingly after upgrading from Flutter 3.7 to 3.10. It is almost unusable for me.

The problem can be reproduced by creating a sample app only with the SfSignaturePad widget (code below) and running on any iOS device or simulator.

import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_signaturepad/signaturepad.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: SfSignaturePad(),
      ),
    );
  }
}

[LavanyaGowtham2021]

We have checked the reported issue with SfSignaturePad and have reproduced it at our end. This issue is replicated with 3.10.0 and later Flutter SDK versions because Flutter uses an impeller rendering engine for iOS by default. Disabling the impeller by following the steps mentioned in the below link can resolve your issue.

Link: https://docs.flutter.dev/perf/impeller#ios