What Is Internet Latency?
Latency is the time delay between when you send a request and when a server responds — measured in milliseconds (ms). Every time you click a link, send a message, or take an action in a game, that action must travel through the internet to a server before the result returns to your screen. Lower latency means faster, more responsive internet. High latency is why some connections feel “laggy” even when download speed is fast. Test your latency now with our free speed test.
Latency vs Ping — What’s the Difference?
Ping measures round-trip time — the time for a packet to go to a server and come back. Latency technically refers to one-way delay. In practice, speed tests and most discussions use ping and latency interchangeably, since round-trip time is what users experience. When your speed test shows 20ms ping, that’s your effective latency for interactive applications.
What Causes High Latency?
Physical distance to the server is unavoidable — signals travel at the speed of light through cables, adding milliseconds per kilometer. Beyond distance: network congestion adds queuing delay as routers process excess traffic; wireless transmission (WiFi) adds 2–10ms overhead versus wired; slow routing adds delay when packets take inefficient paths through the internet; and overloaded servers add processing delay before responding. Understanding these causes points to the right solutions.
Latency by Connection Type — Comparison
| Connection Type | Typical Latency | Notes |
|---|---|---|
| Fiber (FTTH) | 5–15ms | Lowest latency available |
| Cable (DOCSIS) | 15–35ms | Slightly higher due to shared infrastructure |
| DSL | 20–50ms | Depends on distance from exchange |
| 5G (mid-band) | 15–30ms | Low when signal is strong |
| 4G LTE | 30–60ms | Variable; congestion-sensitive |
| Starlink | 25–60ms | Much better than traditional satellite |
| Traditional satellite | 500–800ms | Geosynchronous orbit adds massive delay |
Why Latency Matters More Than Speed for Some Applications
For activities like downloading files or streaming video, bandwidth (speed) matters most. For interactive applications — gaming, video calls, VoIP, online trading, remote desktop — latency is the dominant factor. A 25 Mbps fiber connection with 10ms latency loads web pages and feels snappier than a 200 Mbps cable connection with 40ms latency, because each individual request-response cycle completes faster on the lower-latency connection. This is why fiber vs cable discussions always highlight latency as fiber’s key advantage beyond raw speed.
How to Reduce Latency
Use Ethernet instead of WiFi to eliminate wireless overhead. Connect to servers geographically close to you. Enable QoS on your router to prioritize latency-sensitive traffic. Switch to fiber if available — its dedicated infrastructure provides consistently lower latency than cable. For gaming specifically, see our complete guide on how to reduce ping in gaming.
Related Guides
- What Is Ping?
- What Is Jitter?
- What Is a Good Ping for Gaming?
- High Ping on Wired Connection
- Wired vs Wireless Internet Speed
- Fiber vs Cable Internet
Frequently Asked Questions
Is 50ms latency good?
For casual gaming, video calls, and general browsing — yes, 50ms is acceptable. For competitive gaming it’s marginal — fast-paced titles like CS2 or Valorant feel noticeably sluggish above 40ms. For video calls, 50ms is fine. For VoIP calls, 50ms is excellent — problems only emerge above 150ms for voice quality.
Does upgrading internet speed reduce latency?
Not directly — latency is determined by routing and connection type, not bandwidth. However, a completely saturated connection (where all bandwidth is consumed) causes increased latency due to queuing. Upgrading to a plan with more bandwidth can reduce this congestion-induced latency. Switching from cable to fiber, regardless of speed tier, typically reduces latency by 10–20ms due to fiber’s superior infrastructure.
Why does my latency spike randomly?
Random latency spikes are almost always caused by jitter — inconsistent latency. Common causes: WiFi interference, background downloads saturating bandwidth, router memory issues, or ISP network congestion during peak hours. A wired Ethernet connection eliminates WiFi-caused spikes immediately.