diff --git a/lib/core/services/streaming_helper.dart b/lib/core/services/streaming_helper.dart
index a5b61b1..1eb84c7 100644
--- a/lib/core/services/streaming_helper.dart
+++ b/lib/core/services/streaming_helper.dart
@@ -20,6 +20,28 @@ import 'streaming_response_controller.dart';
 // Keep local verbosity toggle for socket logs
 const bool kSocketVerboseLogging = false;
 
+// Pre-compiled regex patterns for image extraction (performance optimization)
+final _base64ImagePattern = RegExp(
+  r'data:image/[^;\s]+;base64,[A-Za-z0-9+/]+=*',
+);
+final _urlImagePattern = RegExp(
+  r'https?://[^\s<>\"]+\.(jpg|jpeg|png|gif|webp)',
+  caseSensitive: false,
+);
+final _jsonImagePattern = RegExp(
+  r'\{[^}]*"url"[^}]*:[^}]*"(data:image/[^"]+|https?://[^"]+\.(jpg|jpeg|png|gif|webp))"[^}]*\}',
+  caseSensitive: false,
+);
+final _jsonUrlExtractPattern = RegExp(r'"url"[^:]*:[^"]*"([^"]+)"');
+final _partialResultsPattern = RegExp(
+  r'(result|files)="([^"]*(?:data:image/[^"]*|https?://[^"]*\.(jpg|jpeg|png|gif|webp))[^"]*)"',
+  caseSensitive: false,
+);
+final _imageFilePattern = RegExp(
+  r'https?://[^\s]+\.(jpg|jpeg|png|gif|webp)$',
+  caseSensitive: false,
+);
+
 class ActiveSocketStream {
   ActiveSocketStream({
     required this.controller,
@@ -194,7 +216,8 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
 
       final collected = <Map<String, dynamic>>[];
 
-      if (content.contains('<details')) {
+      // Quick check: only parse tool calls if complete details blocks exist
+      if (content.contains('<details') && content.contains('</details>')) {
         final parsed = ToolCallsParser.parse(content);
         if (parsed != null) {
           for (final entry in parsed.toolCalls) {
@@ -209,10 +232,8 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
       }
 
       if (collected.isEmpty) {
-        final base64Pattern = RegExp(
-          r'data:image/[^;\s]+;base64,[A-Za-z0-9+/]+=*',
-        );
-        final base64Matches = base64Pattern.allMatches(content);
+        // Use pre-compiled patterns for better performance
+        final base64Matches = _base64ImagePattern.allMatches(content);
         for (final match in base64Matches) {
           final url = match.group(0);
           if (url != null && url.isNotEmpty) {
@@ -220,11 +241,7 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
           }
         }
 
-        final urlPattern = RegExp(
-          r'https?://[^\s<>\"]+\.(jpg|jpeg|png|gif|webp)',
-          caseSensitive: false,
-        );
-        final urlMatches = urlPattern.allMatches(content);
+        final urlMatches = _urlImagePattern.allMatches(content);
         for (final match in urlMatches) {
           final url = match.group(0);
           if (url != null && url.isNotEmpty) {
@@ -232,25 +249,17 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
           }
         }
 
-        final jsonPattern = RegExp(
-          r'\{[^}]*"url"[^}]*:[^}]*"(data:image/[^"]+|https?://[^"]+\.(jpg|jpeg|png|gif|webp))"[^}]*\}',
-          caseSensitive: false,
-        );
-        final jsonMatches = jsonPattern.allMatches(content);
+        final jsonMatches = _jsonImagePattern.allMatches(content);
         for (final match in jsonMatches) {
-          final url = RegExp(
-            r'"url"[^:]*:[^"]*"([^"]+)"',
-          ).firstMatch(match.group(0) ?? '')?.group(1);
+          final url = _jsonUrlExtractPattern
+              .firstMatch(match.group(0) ?? '')
+              ?.group(1);
           if (url != null && url.isNotEmpty) {
             collected.add({'type': 'image', 'url': url});
           }
         }
 
-        final partialResultsPattern = RegExp(
-          r'(result|files)="([^"]*(?:data:image/[^"]*|https?://[^"]*\.(jpg|jpeg|png|gif|webp))[^"]*)"',
-          caseSensitive: false,
-        );
-        final partialMatches = partialResultsPattern.allMatches(content);
+        final partialMatches = _partialResultsPattern.allMatches(content);
         for (final match in partialMatches) {
           final attrValue = match.group(2);
           if (attrValue != null) {
@@ -259,10 +268,7 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
               collected.addAll(_extractFilesFromResult(decoded));
             } catch (_) {
               if (attrValue.startsWith('data:image/') ||
-                  RegExp(
-                    r'https?://[^\s]+\.(jpg|jpeg|png|gif|webp)$',
-                    caseSensitive: false,
-                  ).hasMatch(attrValue)) {
+                  _imageFilePattern.hasMatch(attrValue)) {
                 collected.add({'type': 'image', 'url': attrValue});
               }
             }
@@ -410,14 +416,9 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
                               : null;
                           if (name is String && name.isNotEmpty) {
                             final msgs = getMessages();
-                            final exists =
-                                (msgs.isNotEmpty) &&
-                                RegExp(
-                                  r'<details\s+type=\"tool_calls\"[^>]*\bname=\"' +
-                                      RegExp.escape(name) +
-                                      r'\"',
-                                  multiLine: true,
-                                ).hasMatch(msgs.last.content);
+                            // Quick string check before expensive regex
+                            final exists = (msgs.isNotEmpty) &&
+                                msgs.last.content.contains('name="$name"');
                             if (!exists) {
                               final status =
                                   '\n<details type="tool_calls" done="false" name="$name"><summary>Executing...</summary>\n</details>\n';
@@ -517,14 +518,9 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
                       : null;
                   if (name is String && name.isNotEmpty) {
                     final msgs = getMessages();
-                    final exists =
-                        (msgs.isNotEmpty) &&
-                        RegExp(
-                          r'<details\s+type=\"tool_calls\"[^>]*\bname=\"' +
-                              RegExp.escape(name) +
-                              r'\"',
-                          multiLine: true,
-                        ).hasMatch(msgs.last.content);
+                    // Quick string check before expensive regex
+                    final exists = (msgs.isNotEmpty) &&
+                        msgs.last.content.contains('name="$name"');
                     if (!exists) {
                       final status =
                           '\n<details type="tool_calls" done="false" name="$name"><summary>Executing...</summary>\n</details>\n';
@@ -552,14 +548,9 @@ ActiveSocketStream attachUnifiedChunkedStreaming({
                             : null;
                         if (name is String && name.isNotEmpty) {
                           final msgs = getMessages();
-                          final exists =
-                              (msgs.isNotEmpty) &&
-                              RegExp(
-                                r'<details\s+type=\"tool_calls\"[^>]*\bname=\"' +
-                                    RegExp.escape(name) +
-                                    r'\"',
-                                multiLine: true,
-                              ).hasMatch(msgs.last.content);
+                          // Quick string check before expensive regex
+                          final exists = (msgs.isNotEmpty) &&
+                              msgs.last.content.contains('name="$name"');
                           if (!exists) {
                             final status =
                                 '\n<details type="tool_calls" done="false" name="$name"><summary>Executing...</summary>\n</details>\n';
diff --git a/lib/core/utils/markdown_stream_formatter.dart b/lib/core/utils/markdown_stream_formatter.dart
index 07dd0a8..45d26b6 100644
--- a/lib/core/utils/markdown_stream_formatter.dart
+++ b/lib/core/utils/markdown_stream_formatter.dart
@@ -1,3 +1,7 @@
+// Pre-compiled regex patterns for markdown syntax detection (performance optimization)
+final _boldPattern = RegExp(r'\*\*');
+final _italicPattern = RegExp(r'(?<!\*)\*(?!\*)');
+
 /// Maintains a raw markdown buffer for streaming content and generates
 /// preview-safe output by appending synthetic closing tokens when necessary.
 class MarkdownStreamFormatter {
@@ -40,12 +44,12 @@ class MarkdownStreamFormatter {
       buffer.writeln('```');
     }
 
-    final boldCount = RegExp(r'\*\*').allMatches(content).length;
+    final boldCount = _boldPattern.allMatches(content).length;
     if (boldCount.isOdd) {
       buffer.write('**');
     }
 
-    final italicCount = RegExp(r'(?<!\*)\*(?!\*)').allMatches(content).length;
+    final italicCount = _italicPattern.allMatches(content).length;
     if (italicCount.isOdd) {
       buffer.write('*');
     }
diff --git a/lib/features/chat/widgets/assistant_message_widget.dart b/lib/features/chat/widgets/assistant_message_widget.dart
index 683f0cd..400716f 100644
--- a/lib/features/chat/widgets/assistant_message_widget.dart
+++ b/lib/features/chat/widgets/assistant_message_widget.dart
@@ -23,6 +23,25 @@ import '../../../core/utils/debug_logger.dart';
 import 'sources/openwebui_sources.dart';
 import '../providers/assistant_response_builder_provider.dart';
 
+// Pre-compiled regex patterns for TTS sanitization (performance optimization)
+final _ttsCodeBlockPattern = RegExp(r'```');
+final _ttsInlineCodePattern = RegExp(r'`');
+final _ttsImagePattern = RegExp(r'!\[(.*?)\]\((.*?)\)');
+final _ttsLinkPattern = RegExp(r'\[(.*?)\]\((.*?)\)');
+final _ttsBoldPattern1 = RegExp(r'\*\*');
+final _ttsBoldPattern2 = RegExp(r'__');
+final _ttsItalicPattern1 = RegExp(r'\*');
+final _ttsItalicPattern2 = RegExp(r'_');
+final _ttsStrikePattern = RegExp(r'~');
+final _ttsListPattern = RegExp(r'^[-*+]\s+', multiLine: true);
+final _ttsQuotePattern = RegExp(r'^>\s?', multiLine: true);
+final _ttsMultiSpacePattern = RegExp(r'[ \t]{2,}');
+final _ttsMultiNewlinePattern = RegExp(r'\n{3,}');
+
+// Pre-compiled regex patterns for image processing (performance optimization)
+final _base64ImagePattern = RegExp(r'data:image/[^;]+;base64,[A-Za-z0-9+/]+=*');
+final _fileIdPattern = RegExp(r'/api/v1/files/([^/]+)/content');
+
 class AssistantMessageWidget extends ConsumerStatefulWidget {
   final dynamic message;
   final bool isStreaming;
@@ -270,23 +289,24 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
     }
 
     var text = input;
-    text = text.replaceAll(RegExp(r'```'), ' ');
-    text = text.replaceAll(RegExp(r'`'), '');
-    text = text.replaceAll(RegExp(r'!\[(.*?)\]\((.*?)\)'), r'$1');
-    text = text.replaceAll(RegExp(r'\[(.*?)\]\((.*?)\)'), r'$1');
-    text = text.replaceAll(RegExp(r'\*\*'), '');
-    text = text.replaceAll(RegExp(r'__'), '');
-    text = text.replaceAll(RegExp(r'\*'), '');
-    text = text.replaceAll(RegExp(r'_'), '');
-    text = text.replaceAll(RegExp(r'~'), '');
-    text = text.replaceAll(RegExp(r'^[-*+]\s+', multiLine: true), '');
-    text = text.replaceAll(RegExp(r'^>\s?', multiLine: true), '');
+    // Use pre-compiled regex patterns for better performance
+    text = text.replaceAll(_ttsCodeBlockPattern, ' ');
+    text = text.replaceAll(_ttsInlineCodePattern, '');
+    text = text.replaceAll(_ttsImagePattern, r'$1');
+    text = text.replaceAll(_ttsLinkPattern, r'$1');
+    text = text.replaceAll(_ttsBoldPattern1, '');
+    text = text.replaceAll(_ttsBoldPattern2, '');
+    text = text.replaceAll(_ttsItalicPattern1, '');
+    text = text.replaceAll(_ttsItalicPattern2, '');
+    text = text.replaceAll(_ttsStrikePattern, '');
+    text = text.replaceAll(_ttsListPattern, '');
+    text = text.replaceAll(_ttsQuotePattern, '');
     text = text.replaceAll('&nbsp;', ' ');
     text = text.replaceAll('&amp;', '&');
     text = text.replaceAll('&lt;', '<');
     text = text.replaceAll('&gt;', '>');
-    text = text.replaceAll(RegExp(r'[ \t]{2,}'), ' ');
-    text = text.replaceAll(RegExp(r'\n{3,}'), '\n\n');
+    text = text.replaceAll(_ttsMultiSpacePattern, ' ');
+    text = text.replaceAll(_ttsMultiNewlinePattern, '\n\n');
     return text.trim();
   }
 
@@ -771,18 +791,17 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
     // Check if content contains image markdown or base64 data URLs
     // This ensures images generated by AI are properly formatted
 
-    // Pattern to detect base64 images that might not be in markdown format
-    final base64Pattern = RegExp(r'data:image/[^;]+;base64,[A-Za-z0-9+/]+=*');
+    // Quick check: only process if we have base64 images and no markdown
+    if (!content.contains('data:image/') || content.contains('![')) {
+      return content;
+    }
 
     // If we find base64 images not wrapped in markdown, wrap them
-    if (base64Pattern.hasMatch(content) && !content.contains('![')) {
-      content = content.replaceAllMapped(base64Pattern, (match) {
+    if (_base64ImagePattern.hasMatch(content)) {
+      content = content.replaceAllMapped(_base64ImagePattern, (match) {
         final imageData = match.group(0)!;
-        // Check if this image is already in markdown format
-        final markdownCheck = RegExp(
-          r'!\[.*?\]\(' + RegExp.escape(imageData) + r'\)',
-        );
-        if (!markdownCheck.hasMatch(content)) {
+        // Check if this image is already in markdown format (simple string check)
+        if (!content.contains('![$imageData)')) {
           return '\n![Generated Image]($imageData)\n';
         }
         return imageData;
@@ -951,9 +970,7 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
         String attachmentId = fileUrl;
         if (fileUrl.contains('/api/v1/files/') &&
             fileUrl.contains('/content')) {
-          final fileIdMatch = RegExp(
-            r'/api/v1/files/([^/]+)/content',
-          ).firstMatch(fileUrl);
+          final fileIdMatch = _fileIdPattern.firstMatch(fileUrl);
           if (fileIdMatch != null) {
             attachmentId = fileIdMatch.group(1)!;
           }
diff --git a/lib/shared/widgets/markdown/streaming_markdown_widget.dart b/lib/shared/widgets/markdown/streaming_markdown_widget.dart
index 06ed932..125f26c 100644
--- a/lib/shared/widgets/markdown/streaming_markdown_widget.dart
+++ b/lib/shared/widgets/markdown/streaming_markdown_widget.dart
@@ -4,6 +4,9 @@ import '../../theme/theme_extensions.dart';
 import 'markdown_config.dart';
 import 'markdown_preprocessor.dart';
 
+// Pre-compiled regex for mermaid diagram detection (performance optimization)
+final _mermaidRegex = RegExp(r'```mermaid\s*([\s\S]*?)```', multiLine: true);
+
 class StreamingMarkdownWidget extends StatelessWidget {
   const StreamingMarkdownWidget({
     super.key,
@@ -23,8 +26,7 @@ class StreamingMarkdownWidget extends StatelessWidget {
     }
 
     final normalized = ConduitMarkdownPreprocessor.normalize(content);
-    final mermaidRegex = RegExp(r'```mermaid\s*([\s\S]*?)```', multiLine: true);
-    final matches = mermaidRegex.allMatches(normalized).toList();
+    final matches = _mermaidRegex.allMatches(normalized).toList();
 
     Widget buildMarkdown(String data) {
       return ConduitMarkdown.buildBlock(