What Are Lag Spikes and How to Fix Them?
If your ping is usually low but suddenly jumps from 40 ms to 300 ms, that’s a lag spike. Even if your average ping looks fine, these spikes ruin your game. Here are the causes and fixes.
How to Detect Lag Spikes
The key indicator is jitter — the variation in your ping. Our ping test tool measures jitter: a high number means an unstable connection, prone to lag spikes. Packet loss often appears alongside spikes too.
Common Causes and Fixes
1. Wi-Fi Interference
Wi-Fi is the number one cause of lag spikes. Microwaves, neighboring networks and walls disrupt the signal. Fix: switch to a wired (Ethernet) connection.
2. Background Traffic
A download, update or cloud backup starting suddenly spikes your ping. Fix: close them during play; defer Windows Update.
3. Other Devices on the Network
When someone at home opens a 4K stream, bandwidth fills up. Fix: use QoS on your router to prioritize your gaming device.
4. Overheating / Old Router
Routers left on for a long time become unstable. Fix: restart the router; replace it if it’s old.
5. ISP-Side Problems
If none of the above apply, the issue may be with your provider. Fix: log your test results for a few days (especially jitter and packet loss) and share them with your ISP.
Quick Checklist
- Go wired → 2. Close background apps → 3. Restart the router → 4. Enable QoS →
- If unresolved, call your ISP.
For general high ping, also see our guide on lowering ping.