@ROTGP (wrong ping, sorry :x @CaiJingLong ) Here's a minimal example. Select a big, wallpaper-size image, preferably several of them, hit multiply a couple times and then start the compression.

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_image_compress/flutter_image_compress.dart';
import 'package:image_picker/image_picker.dart';

void main() =

Describe the bug
I have a zip file about 85.8MB, which contains a big file 218MB(unziped) and a small file 37.1KB(unziped).
I use archive.extract(unzip_dir, targets=[name]) to extact the small file to unzip_dir. It takes about 4s.
I dig into the code, and find it was caused by these lines.
https://github.com/miurahr/py7zr/blob/2433c8418de26516d659932ff271b22f46db561d/py7zr/py7zr.py#L1