performance fixes

packages/stream_chat_flutter/lib/src/attachment/file_attachment.dart

@@ -3,10 +3,10 @@ import 'package:flutter/material.dart';
 import 'package:shimmer/shimmer.dart';
 import 'package:stream_chat_flutter/src/stream_chat_theme.dart';
 import 'package:stream_chat_flutter/src/stream_svg_icon.dart';
+import 'package:stream_chat_flutter/src/upload_progress_indicator.dart';
 import 'package:stream_chat_flutter/src/utils.dart';
 import 'package:stream_chat_flutter/src/video_thumbnail_image.dart';
 import 'package:stream_chat_flutter_core/stream_chat_flutter_core.dart';
-import 'package:stream_chat_flutter/src/upload_progress_indicator.dart';
 
 // ignore: always_use_package_imports
 import 'attachment_widget.dart';
@@ -103,7 +103,7 @@ class FileAttachment extends AttachmentWidget {
   Widget _getFileTypeImage(BuildContext context) {
     if (isImageAttachment) {
       return Material(
-        clipBehavior: Clip.antiAlias,
+        clipBehavior: Clip.hardEdge,
         type: MaterialType.transparency,
         shape: _getDefaultShape(context),
         child: source.when(
@@ -154,7 +154,7 @@ class FileAttachment extends AttachmentWidget {
 
     if (isVideoAttachment) {
       return Material(
-        clipBehavior: Clip.antiAlias,
+        clipBehavior: Clip.hardEdge,
         type: MaterialType.transparency,
         shape: _getDefaultShape(context),
         child: source.when(

packages/stream_chat_flutter/lib/src/attachment/giphy_attachment.dart

@@ -53,7 +53,7 @@ class GiphyAttachment extends AttachmentWidget {
         Card(
           color: StreamChatTheme.of(context).colorTheme.white,
           elevation: 2,
-          clipBehavior: Clip.antiAlias,
+          clipBehavior: Clip.hardEdge,
           shape: const RoundedRectangleBorder(
             borderRadius: BorderRadius.only(
               topRight: Radius.circular(16),

packages/stream_chat_flutter/lib/src/attachment/image_attachment.dart

@@ -74,16 +74,16 @@ class ImageAttachment extends AttachmentWidget {
           if (imageUri.host == 'stream-io-cdn.com') {
             imageUri = imageUri.replace(queryParameters: {
               ...imageUri.queryParameters,
-              'h': '500',
-              'w': '500',
+              'h': '400',
+              'w': '400',
               'crop': 'center',
               'resize': 'crop',
             });
           } else if (imageUri.host == 'stream-cloud-uploads.imgix.net') {
             imageUri = imageUri.replace(queryParameters: {
               ...imageUri.queryParameters,
-              'height': '500',
-              'width': '500',
+              'height': '400',
+              'width': '400',
               'fit': 'crop',
             });
           }
@@ -92,10 +92,10 @@ class ImageAttachment extends AttachmentWidget {
           return _buildImageAttachment(
             context,
             CachedNetworkImage(
-              cacheKey: imageUri.path,
+              cacheKey: imageUrl,
               height: size?.height,
               width: size?.width,
-              placeholder: (_, __) {
+              placeholder: (context, __) {
                 final image = Image.asset(
                   'images/placeholder.png',
                   fit: BoxFit.cover,