Lag spikes in League of Legends are one of the fastest ways to lose a game you were winning. One moment you're landing a perfect ability combo; the next, your champion freezes, rubberbands across the map, and you die to an enemy you couldn't react to. This guide walks you through every reliable fix — from diagnosing the spike with a ping test all the way to switching to a wired connection and tuning your router settings.
What causes lag spikes in League of Legends?
League of Legends is a competitive real-time game that relies on a low-latency connection to Riot's servers. Lag spikes — sudden, temporary jumps in ping — can come from several different sources:
- Wi-Fi instability — wireless interference from nearby networks, walls, or other devices causes packet loss and ping variance even when your average speed looks fine.
- Background bandwidth usage — Windows Update, cloud-sync services (OneDrive, Dropbox), Discord video, or a browser streaming video all compete with League for bandwidth.
- Outdated or corrupted network drivers — an old driver can mishandle burst traffic, showing up as lag spikes rather than consistently high ping.
- GPU-induced stutter — high graphical settings push your graphics card hard; when it can't keep up, frames freeze and feel exactly like network lag.
- DNS or routing issues — your ISP's default DNS or routing table might send packets on a suboptimal path to Riot's servers.
How to fix lag spikes in League of Legends
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Step 1: Run a ping test to diagnose the spike
Before you change anything, confirm that the spikes are network-related and not a GPU stutter. Open Command Prompt (Win + R, type
cmd, press Enter) and run a continuous ping while League is open:ping 8.8.8.8 -t. Watch for individual replies that jump far above the average — these are your spikes. A healthy gaming connection shows replies consistently below 60 ms with no outliers above 150 ms. If you see replies of 300 ms or higher mixed in with normal numbers, the problem is your network path, not your PC hardware.
Run ping 8.8.8.8 -tin Command Prompt while League is running. A reply above 200 ms mixed with normal ones is a classic lag spike signature. -
Step 2: Update or reinstall your network driver
An outdated network adapter driver is a surprisingly common cause of intermittent lag spikes that don't show up as consistently high ping. Open Device Manager (right-click the Start button, then choose Device Manager), expand Network adapters, right-click your Ethernet or Wi-Fi adapter, and select Update driver. Choose "Search automatically for drivers." If Windows says the driver is current, visit your motherboard or laptop manufacturer's website and download the latest LAN or Wi-Fi driver directly. After installing, restart your PC and re-test with the ping command from Step 1.
Right-click your network adapter in Device Manager and choose Update driver. For the freshest driver, check your motherboard manufacturer's support page. -
Step 3: Lower in-game video and network settings
During a game, press Esc, go to Video, and reduce the following settings: set Character Quality, Environment Quality, and Shadow Quality to Very Low; turn Anti-Aliasing to None; and disable Vertical Sync. Also navigate to the Game tab and ensure the peer-to-peer option is disabled. Lowering graphics reduces GPU load, which prevents the rendering thread from delaying network packets — a very common source of lag spikes that players mistake for a pure network problem. Cap your frame rate at 60 FPS or your monitor's refresh rate to keep GPU usage steady.
Set all quality options to Very Low and cap the frame rate. A lighter GPU load directly reduces in-game stutter that mimics lag spikes. -
Step 4: Close bandwidth-heavy background apps
Open Task Manager (Ctrl + Shift + Esc) and click the Network column header to sort processes by network usage. Right-click any process consuming significant bandwidth — Chrome, Discord (especially if video calling), Spotify, and Windows Update are the usual offenders — and select End Task. Also disable automatic Windows Update during gaming sessions: search for "Windows Update settings" and set Active Hours so updates never download while you're likely to be playing. Cloud backup tools (OneDrive, Google Drive, Dropbox) can be paused from their system-tray icons.
Sort by the Network column to quickly spot bandwidth thieves. End them before queuing up — Windows Update in particular can trigger massive spikes mid-game. -
Step 5: Switch to Ethernet and optimise your network settings
If you are currently on Wi-Fi, plugging in an Ethernet cable is the single biggest improvement you can make. Wi-Fi adds latency variance by design — even a strong signal introduces jitter that you cannot fully eliminate. Once wired, go to Settings > Network & Internet > Ethernet > Edit and set your DNS servers to Google DNS (8.8.8.8 / 8.8.4.4) or Cloudflare DNS (1.1.1.1 / 1.0.0.1). These public DNS servers are typically faster and more reliable than your ISP's default. If your router supports Quality of Service (QoS), log into its admin panel and prioritise gaming traffic or the device running League of Legends.
Set your Preferred DNS to 8.8.8.8 and enable QoS on your router to give League's traffic priority over other devices on your network.
Extra tips to keep ping stable
- Choose the correct server region. In the League of Legends client, go to Settings and confirm you are connected to the server region closest to you geographically. Playing on the wrong region adds 50–200 ms of unavoidable ping.
- Restart your router regularly. Routers accumulate connection tables over days of use. A weekly restart often resolves creeping baseline ping increases.
- Use 5 GHz Wi-Fi if you must stay wireless. If running an Ethernet cable is not possible, connect to your router's 5 GHz band rather than 2.4 GHz. It has shorter range but much lower congestion and interference.
- Check Riot's server status. Sometimes the lag is on Riot's end, not yours. The official Riot Games server status page shows live outages and maintenance windows.
- Repair the League client. In the Riot Client, click the settings gear beside "Play," then choose "Repair." Corrupted game files can cause the client to stutter and misreport as network lag.
Troubleshooting
The lag spikes only happen in League, not other games
This points to a League-specific issue rather than a general network problem. Try repairing the client (Settings → Repair), flushing your DNS cache (ipconfig /flushdns in Command Prompt), and disabling any VPN or proxy you might have active. Also check whether the spikes coincide with specific in-game events like large team fights, which spike GPU usage suddenly.
My ping is low but the game still feels laggy
Low average ping with visible lag is almost always frame stutter, not network lag. Lower your graphics settings as described in Step 3, cap your frame rate, and close background CPU-heavy apps. Run Task Manager and check whether the CPU usage column shows any process spiking to 100% during your perceived lag.
Nothing works and the lag is severe
Contact your ISP and ask about packet loss on your line — a damaged cable between your house and the street cabinet can cause exactly this pattern. Run a traceroute (tracert 8.8.8.8) and look for a hop with consistently high latency or timeouts, then share those results with your ISP's support team.
Frequently asked questions
Why does my League of Legends ping spike randomly?
Random ping spikes are almost always caused by one of four things: background apps consuming bandwidth (Windows Update, cloud sync, video streaming), Wi-Fi interference or packet loss, an outdated network driver mishandling burst traffic, or a routing issue between your ISP and Riot's servers. Work through Steps 1–5 above in order to find and fix the specific cause.
Does lowering graphics settings actually reduce lag spikes?
Yes, in many cases. When your GPU is running at near 100% capacity, the rendering thread can block the network thread briefly, causing frames to freeze in a way that looks and feels identical to a network spike. Dropping quality settings keeps GPU utilisation headroom available and eliminates this source of stutter without touching your internet connection at all.
Will a VPN reduce my ping in League of Legends?
Usually not — VPNs almost always increase latency by routing your traffic through an additional server. The only case where a gaming VPN might help is if your ISP is throttling gaming traffic or routing you on an extremely inefficient path to Riot's servers. Test without a VPN first; add one only if your traceroute reveals a specific routing problem your ISP won't fix.
How do I check my ping inside League of Legends?
Press Ctrl + F during a match to toggle the FPS and network performance overlay. It shows your current ping in milliseconds in the top-right corner of the screen. A reading that jumps erratically (e.g., 40 ms then 350 ms) confirms a spike rather than consistently high latency.
What is a good ping for League of Legends?
Under 60 ms is comfortable for most players. Below 40 ms feels near-instant. Anything above 100 ms starts to affect ability timing noticeably, and spikes above 200 ms make the game nearly unplayable for the duration of the spike.
Conclusion
Fixing lag spikes in League of Legends is usually a combination of small improvements that add up: closing background apps, updating your driver, lowering settings to free up GPU headroom, and switching to a wired connection. Start with the ping test in Step 1 to confirm whether the spikes are network or hardware related, then work through each step in order. Most players see a significant improvement after Step 4 or 5 even without any hardware upgrade. For official information about League's network requirements, visit the Riot Games support site.
