From 7352aa8677e29a81a9201504099b0455b6f915ec Mon Sep 17 00:00:00 2001
From: Vendicated <vendicated@riseup.net>
Date: Tue, 29 Sep 2026 19:33:39 +0200
Subject: [PATCH 1/2] fix severe lag caused by bad Discord css

---
 src/plugins/_core/fixDiscordCss.ts | 59 ++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/plugins/_core/fixDiscordCss.ts

diff --git a/src/plugins/_core/fixDiscordCss.ts b/src/plugins/_core/fixDiscordCss.ts
new file mode 100644
index 000000000..0f9c8471c
--- /dev/null
+++ b/src/plugins/_core/fixDiscordCss.ts
@@ -0,0 +1,59 @@
+/*
+ * Vencord, a Discord client mod
+ * Copyright (c) 2026 Vendicated and contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+import { Devs } from "@utils/constants";
+import { Logger } from "@utils/Logger";
+import definePlugin, { StartAt } from "@utils/types";
+
+let observer: MutationObserver;
+
+function cleanSheet(sheet: CSSStyleSheet) {
+    try {
+        const rules = sheet.cssRules;
+        if (!rules) return;
+
+        for (let i = 0; i < rules.length; i++) {
+            const rule = rules[i];
+
+            if ((rule as CSSStyleRule).selectorText?.includes(":has(.gameOption_")) {
+                new Logger("FixDiscordCss").info("Removed problematic CSS rule", rule.cssText);
+                sheet.deleteRule(i);
+                observer.disconnect();
+                break;
+            }
+        }
+    } catch (e) { }
+}
+
+function handleNode(node: Node) {
+    if (node.nodeType !== Node.ELEMENT_NODE || !(node as HTMLElement).matches('link[rel="stylesheet"]')) return;
+
+    const linkNode = node as HTMLLinkElement;
+
+    if (linkNode.sheet) {
+        cleanSheet(linkNode.sheet);
+    } else {
+        node.addEventListener("load", () => cleanSheet(linkNode.sheet!), { once: true });
+    }
+}
+
+export default definePlugin({
+    name: "FixDiscordCss",
+    description: "Fixes Discord's css lag",
+    authors: [Devs.Ven],
+    required: true,
+
+    startAt: StartAt.DOMContentLoaded,
+
+    start() {
+        observer = new MutationObserver(mutations => {
+            for (const m of mutations) {
+                m.addedNodes.forEach(handleNode);
+            }
+        });
+        observer.observe(document.head, { childList: true });
+    }
+});

From 7f0c10cc29fd789f2f4828ae3dc947623e837920 Mon Sep 17 00:00:00 2001
From: Vendicated <vendicated@riseup.net>
Date: Tue, 29 Sep 2026 19:41:03 +0200
Subject: [PATCH 2/2] v1.15.9

---
 package.json                       | 2 +-
 src/plugins/_core/fixDiscordCss.ts | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/package.json b/package.json
index 126c86a79..0f3a7dc5f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "vencord",
     "private": "true",
-    "version": "1.15.8",
+    "version": "1.15.9",
     "description": "The cutest Discord client mod",
     "homepage": "https://github.com/Vendicated/Vencord#readme",
     "bugs": {
diff --git a/src/plugins/_core/fixDiscordCss.ts b/src/plugins/_core/fixDiscordCss.ts
index 0f9c8471c..22dd4562c 100644
--- a/src/plugins/_core/fixDiscordCss.ts
+++ b/src/plugins/_core/fixDiscordCss.ts
@@ -8,7 +8,7 @@ import { Devs } from "@utils/constants";
 import { Logger } from "@utils/Logger";
 import definePlugin, { StartAt } from "@utils/types";
 
-let observer: MutationObserver;
+let observer: MutationObserver | null;
 
 function cleanSheet(sheet: CSSStyleSheet) {
     try {
@@ -21,7 +21,8 @@ function cleanSheet(sheet: CSSStyleSheet) {
             if ((rule as CSSStyleRule).selectorText?.includes(":has(.gameOption_")) {
                 new Logger("FixDiscordCss").info("Removed problematic CSS rule", rule.cssText);
                 sheet.deleteRule(i);
-                observer.disconnect();
+                observer!.disconnect();
+                observer = null;
                 break;
             }
         }