A simple wrapper for CachedNetworkImage that lets you specify caching parameters globally.

optimized_network_image.dart

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:flutter_cache_manager/flutter_cache_manager.dart';
import 'package:resmedia_manita_flutter/references.dart';

class OptimizedNetworkImage extends StatelessWidget {
  final String imageUrl;
  final Widget Function(BuildContext, String) placeholder;
  final BoxFit fit;

  const OptimizedNetworkImage({
    Key key,
    @required this.imageUrl,
    this.placeholder,
    this.fit = BoxFit.cover,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CachedNetworkImage(
      imageUrl: this.imageUrl,
      placeholder: this.placeholder ?? (BuildContext context, String imageUrl) => Center(child: CircularProgressIndicator()),
      fit: BoxFit.cover,
      maxWidthDiskCache: References.optimizedImageMaxSize,
      maxHeightDiskCache: References.optimizedImageMaxSize,
      cacheManager: CustomCacheManager(),
    );
  }
}

class CustomCacheManager extends CacheManager with ImageCacheManager {
  static const String key = 'customCacheKey';

  static Config config = Config(
    key,
    stalePeriod: const Duration(days: 5),
    maxNrOfCacheObjects: 384,
    repo: JsonCacheInfoRepository(databaseName: key),
    // fileSystem: IOFileSystem(key),
    fileService: HttpFileService(),
  );

  CustomCacheManager() : super(config);
}