How to Fix Lag
Try these first — they're free and solve the problem for most people.
01 Use a wired Ethernet connection instead of WiFi
1. Connect your PC or laptop directly to your router with an Ethernet cable 2. Disable WiFi in Windows (Settings → Network → WiFi → toggle off) to force all traffic through the cable 3. Relaunch Stardew Valley and rejoin the co-op session 4. If Ethernet cable is not available, USB tethering from your phone (5G/LTE) gives a dedicated, low-interference signal
WiFi introduces jitter — small random spikes in latency caused by interference, neighboring networks, and signal fluctuation. For a host-based game like Stardew Valley, stable latency matters more than raw speed. Wired connections eliminate WiFi jitter entirely.
02 Enable IPv4 preference for Steam connections
1. Open Steam → Settings → Downloads 2. Scroll to 'Download Region' and ensure it is set to your nearest region 3. Close and reopen Steam 4. In Windows: press Win+R, type 'ncpa.cpl', press Enter 5. Right-click your active network adapter → Properties 6. Find 'Internet Protocol Version 6 (TCP/IPv6)' and uncheck it temporarily if you suspect IPv6 routing issues
Steam P2P connections can sometimes route suboptimally over IPv6. Preferring IPv4 ensures the most predictable routing path to your host. Only do this as a test — re-enable IPv6 afterward if it makes no difference.
03 Close bandwidth-heavy background applications
1. Press Ctrl+Shift+Esc to open Task Manager 2. Click the 'Network' column header to sort by network usage (highest first) 3. Look for: game downloaders (Steam, Epic), cloud sync (OneDrive, Google Drive, Dropbox), video streaming (YouTube background tab, Spotify) 4. Right-click and 'End Task' on anything consuming bandwidth you don't need 5. Also check Windows Update: Settings → Windows Update → Pause updates for 1 week
Stardew Valley uses minimal bandwidth, but background uploads (cloud backup, Windows Update) can spike your connection's upload capacity. Since co-op sends game state from the farmhand to the host, upload saturation directly causes lag spikes during play.
General network tips (not Stardew Valley-specific)
04 Check your connection to the host
1. Stardew Valley has no built-in ping display — use external tools 2. Open Windows Task Manager (Ctrl+Shift+Esc) → Performance → Open Resource Monitor → Network tab 3. Find 'Stardew Valley.exe' in the process list and watch the Send/Receive columns during play 4. Consistent data flow = stable connection; gaps or zero activity = connectivity issues 5. For a numeric ping test: ask your host friend for their IP, open Command Prompt, and run 'ping <their-IP> -t' while playing
Doesn't fix anything — but helps you determine if your problem is network (variable latency, packet loss) or host-side (host's PC struggling, host's internet). If your connection is fine but the game still stutters, the issue is likely on the host's end.
Regions with good connectivity
Players in these regions likely won't benefit much from a network optimizer.
- Global — P2P game — no dedicated server regions. Latency depends entirely on host player location and ISP routing between players. The slow game pace means even 150-200ms is generally playable.
Still lagging? The problem is likely your ISP's routing to the game servers.
PingAim detects Stardew Valley automatically
No manual config. PingAim identifies Stardew Valley by process name and routes it through your fastest connection using a kernel-level WFP driver.