How to Fix Lag
Try these first — they're free and solve the problem for most people.
01 Disable SIP ALG on your router
1. Open your router admin panel (type 192.168.1.1 or 192.168.0.1 in browser) 2. Look for 'SIP ALG', 'SIP passthrough', or 'Application Layer Gateway' — usually under Firewall or Advanced > NAT 3. Disable it 4. Save and restart your router 5. Relaunch iRacing and check connection quality
Fixes a common cause of random disconnects and UDP packet corruption. Documented solution for Netgear routers and many others. Free, immediate fix.
02 Use wired Ethernet — never WiFi for iRacing
1. Run an Ethernet cable from your sim rig PC to your router 2. Open Windows Settings > Network & Internet > Wi-Fi 3. Turn Wi-Fi off entirely, or right-click the WiFi adapter in Device Manager and disable it 4. Restart iRacing 5. In the in-sim FPS display (press F), confirm ping has stabilized
WiFi introduces 2–15ms of jitter — the kind of latency variation that causes unpredictable prediction errors in close racing. Wired eliminates this. Single most impactful free change for WiFi users.
General network tips (not iRacing-specific)
03 Check your ping to iRacing servers using PingPlotter
1. Download PingPlotter Free (pingplotter.com) 2. Ping one of iRacing's known server IPs (e.g. 67.218.1.1 as a starting point) 3. Run for 10 minutes during your normal racing time 4. Look at the chart — consistent high latency means routing issue. Spikey pattern means jitter/congestion. 5. Compare before and after enabling PingAim.
Baseline measurement. Shows whether your problem is consistently high ping (routing) vs. spiky ping (congestion) vs. packet loss (ISP issue).
04 Set Connection Speed to maximum in iRacing options
1. Open iRacingUI 2. Go to Settings (gear icon) > Network tab 3. Set 'Connection Speed' to 1 Mbit/sec or higher (use the highest your connection supports) 4. This controls how much car data you exchange per update — low settings mean you see fewer cars' positions
Ensures full position update data for all cars in the race. Critical for oval races with 40+ cars. Does not reduce ping but ensures maximum data quality.
05 Add iRacing as highest priority in your router's QoS settings
1. Log in to router admin panel 2. Find QoS (Quality of Service) settings — usually under Advanced or Traffic Management 3. Add a rule: Protocol UDP, destination port range 15000–52500, priority: Highest 4. Alternatively if your router supports per-device QoS, set your sim rig PC to highest priority 5. Save settings
Prevents streaming, downloads, or other household devices from competing with iRacing UDP packets during a race. Most impactful in shared households.
06 Check iRacing status before any race session
1. Go to https://status.iracing.com/ 2. Check that all server farms (US, EU, AP) show 'Operational' 3. If a farm is degraded or experiencing issues, your race session on that farm will have network problems that no client-side tool can fix 4. Consider hosting a User-Created Race (UCR) on a different farm if an official farm is degraded
Rules out server-side causes before spending time on client-side troubleshooting.
Still lagging? The problem is likely your ISP's routing to the game servers.
PingAim detects iRacing automatically
No manual config. PingAim identifies iRacing by process name and routes it through your fastest connection using a kernel-level WFP driver.