Known Lag Problems
These problems are reported by real players. If your region or ISP is listed, a network optimizer is likely to help.
Oceania
80-250ms- Players without an Oceania AWS node may connect to Singapore or US West, adding 100-250ms latency
- Smaller player population post-development-shutdown means longer queues and possible cross-region matchmaking
South America
100-200ms- No South America AWS region confirmed for Back 4 Blood — LATAM players likely routed to US East
- Typical cross-continent routing adds 80-150ms to base latency
What players commonly report
- Long matchmaking queues after development ended
- Connection drops to profile service (Failed to Sign In errors)
- No server region selector — can't control which AWS node you hit
- Matchmaking sometimes connects players across regions, increasing latency
How to Fix It
Try these first — they're free and solve the problem for most people.
01 Use a wired Ethernet connection instead of WiFi
1. Plug an Ethernet cable from your PC directly to your router or modem 2. In Windows, go to Settings → Network & Internet → Status 3. Make sure 'Ethernet' shows as your active connection (not WiFi) 4. Disable WiFi in Windows to force all traffic over the cable 5. Launch Back 4 Blood and check your in-game ping
WiFi adds 5-30ms of latency and introduces jitter from interference. A wired connection gives stable, consistent ping — important for reliable hit registration in co-op combat. Most impactful improvement if you're currently on WiFi.
02 Close bandwidth-heavy background applications
1. Before launching the game, open Task Manager (Ctrl+Shift+Esc) 2. Click the 'Network' column header to sort by network usage 3. Close any apps actively using your connection: Windows Update, Steam downloads, cloud sync (OneDrive, Google Drive), browser with video tabs 4. Disable automatic Windows Update temporarily: Settings → Windows Update → Pause updates 5. Check your router for other devices on the same network streaming or downloading
Back 4 Blood uses continuous UDP streams to maintain game state. A 4-player co-op session uses roughly 2-5 Mbps — not much, but jitter from competing traffic on a congested connection will cause rubber-banding and missed shots that feel like lag.
General network tips (not Back 4 Blood-specific)
03 Check your connection to the game server using Resource Monitor
1. Launch Back 4 Blood and enter a match 2. Press Ctrl+Shift+Esc to open Task Manager, then go to Performance → Open Resource Monitor 3. Click the Network tab and find Back4Blood.exe in the process list 4. Watch the Send (B/sec) and Receive (B/sec) columns during play 5. Consistent data flow = stable connection; gaps or zero activity = connectivity issues 6. During intense Ridden encounters, check if network activity spikes or drops — drops indicate packet loss
Back 4 Blood does not have a confirmed built-in numeric ping display. Resource Monitor shows you real-time network activity for the game process, helping you determine if issues are network-related (variable throughput, drops) or client-side (GPU/CPU). If you see stable network flow but the game still stutters, the issue is on your PC, not the network.
04 Add Back4Blood.exe to Windows Firewall allowed apps
1. Open Windows Defender Firewall (search in Start menu) 2. Click 'Allow an app or feature through Windows Defender Firewall' 3. Click 'Change settings' then 'Allow another app' 4. Browse to: C:\Program Files (x86)\Steam\steamapps\common\Back4Blood\Gobi\Binaries\Win64\Back4Blood.exe 5. Allow both Private and Public network access 6. Also add EasyAntiCheat.exe from C:\Program Files (x86)\EasyAntiCheat\ 7. Restart the game
Windows Firewall can silently block or delay UDP packets to/from the game executable, causing connection drops and desync. The Back 4 Blood installer does not always create the required firewall rules automatically — adding them manually ensures the game has unrestricted network access.
05 Flush DNS cache to fix 'Failed to Sign In' errors
1. Open Command Prompt as Administrator (search 'cmd', right-click → Run as administrator) 2. Type: ipconfig /flushdns and press Enter 3. Type: ipconfig /release and press Enter, then: ipconfig /renew 4. Restart Back 4 Blood 5. If the issue persists, try switching your DNS to Cloudflare (1.1.1.1) or Google (8.8.8.8) in your network adapter settings
Back 4 Blood connects to api-prod.back4blood.com on startup for authentication. Stale DNS cache or a slow DNS server can cause 'Failed to Sign In' errors or slow connection to the profile service layer. Flushing DNS forces a fresh lookup.
Regions with good connectivity
Players in these regions likely won't benefit much from a network optimizer.
- North America East — Closest to the primary AWS us-east-1 region — best ping and highest population
- Western Europe — Served by AWS eu-west-1 (Ireland) — generally good latency for UK and Western Europe
Still lagging? The problem is likely your ISP's routing to the game servers.
PingAim detects Back 4 Blood automatically
No manual config. PingAim identifies Back 4 Blood by process name and routes it through your fastest connection using a kernel-level WFP driver.