From 5c5ae4a6ecac10222dc7cef2bce2f76801f29b2b Mon Sep 17 00:00:00 2001
From: ZhuchkaTriplesix <mrlololoshka94@gmail.com>
Date: Wed, 29 Jul 2026 11:42:17 +0300
Subject: [PATCH] perf: offload heavy JSON decoding to isolate

Resolves #538
---
 lib/core/market/http_marketplace_repository.dart | 7 +++++--
 lib/core/updater/github_releases_client.dart     | 7 +++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/lib/core/market/http_marketplace_repository.dart b/lib/core/market/http_marketplace_repository.dart
index e49694fb..0321021e 100644
--- a/lib/core/market/http_marketplace_repository.dart
+++ b/lib/core/market/http_marketplace_repository.dart
@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+import 'dart:isolate';
 import 'package:archive/archive.dart';
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
@@ -72,7 +73,8 @@ class HttpMarketplaceRepository implements MarketplaceRepository {
     if (response.statusCode != 200) {
       throw MarketplaceException('Failed to load trending extensions (HTTP ${response.statusCode})');
     }
-    final List<dynamic> data = jsonDecode(response.body) as List<dynamic>;
+    final body = response.body;
+    final List<dynamic> data = await Isolate.run(() => jsonDecode(body)) as List<dynamic>;
     return data.map((json) => ExtensionManifest.fromJson(json as Map<String, dynamic>)).toList();
   }
 
@@ -89,7 +91,8 @@ class HttpMarketplaceRepository implements MarketplaceRepository {
     if (response.statusCode != 200) {
       throw MarketplaceException('Search failed (HTTP ${response.statusCode})');
     }
-    final List<dynamic> data = jsonDecode(response.body) as List<dynamic>;
+    final body = response.body;
+    final List<dynamic> data = await Isolate.run(() => jsonDecode(body)) as List<dynamic>;
     return data.map((json) => ExtensionManifest.fromJson(json as Map<String, dynamic>)).toList();
   }
 
diff --git a/lib/core/updater/github_releases_client.dart b/lib/core/updater/github_releases_client.dart
index a22fed25..d262040e 100644
--- a/lib/core/updater/github_releases_client.dart
+++ b/lib/core/updater/github_releases_client.dart
@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'dart:isolate';
 
 import 'package:http/http.dart' as http;
 
@@ -28,7 +29,8 @@ class GitHubReleasesClient {
           'GitHub Releases API returned HTTP ${response.statusCode}',
         );
       }
-      final decoded = jsonDecode(response.body);
+      final body = response.body;
+      final decoded = await Isolate.run(() => jsonDecode(body));
       if (decoded is! Map<String, dynamic>) {
         throw const GitHubReleasesException('Unexpected GitHub Releases payload');
       }
@@ -41,7 +43,8 @@ class GitHubReleasesClient {
         'GitHub Releases API returned HTTP ${response.statusCode}',
       );
     }
-    final decoded = jsonDecode(response.body);
+    final body = response.body;
+    final decoded = await Isolate.run(() => jsonDecode(body));
     if (decoded is! List) {
       throw const GitHubReleasesException('Unexpected GitHub Releases list payload');
     }