diff --git a/src/renderer/src/features/download-slice.ts b/src/renderer/src/features/download-slice.ts
index ae0c9c9d..80d78b0d 100644
--- a/src/renderer/src/features/download-slice.ts
+++ b/src/renderer/src/features/download-slice.ts
@@ -30,6 +30,15 @@ export const downloadSlice = createSlice({
     setLastPacket: (state, action: PayloadAction<DownloadProgress | null>) => {
       state.lastPacket = action.payload;
       if (!state.gameId && action.payload) state.gameId = action.payload.gameId;
+
+      // Track peak speed atomically when packet arrives
+      if (action.payload?.gameId && action.payload.downloadSpeed != null) {
+        const { gameId, downloadSpeed } = action.payload;
+        const currentPeak = state.peakSpeeds[gameId] || 0;
+        if (downloadSpeed > currentPeak) {
+          state.peakSpeeds[gameId] = downloadSpeed;
+        }
+      }
     },
     clearDownload: (state) => {
       state.lastPacket = null;
diff --git a/src/renderer/src/pages/downloads/download-group.tsx b/src/renderer/src/pages/downloads/download-group.tsx
index 56ab398b..7c3f0f77 100644
--- a/src/renderer/src/pages/downloads/download-group.tsx
+++ b/src/renderer/src/pages/downloads/download-group.tsx
@@ -16,7 +16,7 @@ import {
   useLibrary,
   useDate,
 } from "@renderer/hooks";
-import { updatePeakSpeed, clearPeakSpeed } from "@renderer/features";
+import { clearPeakSpeed } from "@renderer/features";
 
 import "./download-group.scss";
 import { useTranslation } from "react-i18next";
@@ -585,8 +585,6 @@ export function DownloadGroup({
     const gameId = lastPacket.gameId;
     const downloadSpeed = lastPacket.downloadSpeed;
 
-    dispatch(updatePeakSpeed({ gameId, speed: downloadSpeed }));
-
     if (!speedHistoryRef.current[gameId]) {
       speedHistoryRef.current[gameId] = [];
     }
@@ -596,7 +594,7 @@ export function DownloadGroup({
     if (speedHistoryRef.current[gameId].length > 120) {
       speedHistoryRef.current[gameId].shift();
     }
-  }, [lastPacket, dispatch]);
+  }, [lastPacket]);
 
   useEffect(() => {
     for (const game of library) {