WiFi vs Ethernet: Real Speed Difference & When It Matters
Should you bother running an Ethernet cable? We measured real-world speed, ping, and stability differences between WiFi and wired connections β and the gap is larger than most people expect.
Quick Comparison
πΆ WiFi
- Convenient, no cables
- 5β30ms added latency
- Speed varies by distance
- Susceptible to interference
- Higher jitter (inconsistent)
π Ethernet
- Requires a cable
- 1β3ms added latency
- Full router speed always
- No wireless interference
- Extremely consistent
Real-World Speed Numbers
These are typical results from the same 500 Mbps plan β measured on the same device, same router:
| Connection | Download | Upload | Ping | Jitter |
|---|---|---|---|---|
| Ethernet (direct) | 487 Mbps | 492 Mbps | 2ms | 0.3ms |
| WiFi 5GHz (same room) | 340 Mbps | 310 Mbps | 8ms | 3ms |
| WiFi 5GHz (next room) | 180 Mbps | 160 Mbps | 15ms | 8ms |
| WiFi 2.4GHz (same room) | 95 Mbps | 80 Mbps | 22ms | 15ms |
| WiFi (through 2 walls) | 55 Mbps | 40 Mbps | 35ms | 30ms |
Even in the same room, WiFi delivers only ~70% of the wired speed. Through walls, you may get only 10β20% of your plan's speed. Ethernet always delivers nearly 100%.
When Does It Actually Matter?
Always Use Ethernet For:
- Competitive gaming β Every millisecond counts. Ethernet gives you 10β30ms less ping and near-zero jitter.
- Video calls / WFH β Prevents freezing and dropped connections during important meetings.
- 4K streaming on a smart TV β Especially if the TV is in a different room from the router.
- Large file downloads / uploads β Cloud backup, uploading videos, downloading games significantly faster.
- Desktop PCs β No mobility needed. There's no reason not to use Ethernet.
WiFi Is Fine For:
- Smartphones and tablets β Moving around makes cables impractical.
- Laptops (casual use) β Browsing, email, and HD video don't require Ethernet-level performance.
- Smart home devices β Smart bulbs, thermostats, and cameras need very little bandwidth.
How to Switch to Ethernet
If your device doesn't have an Ethernet port (common on modern laptops and some smart TVs), you have two options:
- USB-C to Ethernet adapter β ~$15β30, works with most modern laptops and some TVs. Plug in, no setup required.
- Powerline adapter β Sends network signal through your home's electrical wiring. Good option when running a cable isn't practical. Slower than direct Ethernet but far better than WiFi through walls.
How to Test Your Own Setup Fairly
To compare WiFi and Ethernet accurately, test the same device, in the same room, at the same time of day. First run the test on WiFi and write down download, upload, ping, and jitter. Then plug in Ethernet, turn WiFi off on the device, and run the same test again. If you leave WiFi enabled, some laptops may keep using wireless even while the cable is connected.
Look beyond download speed. Ethernet usually wins most clearly on ping and jitter, which is why it feels better for gaming and video calls even when the raw Mbps difference is not dramatic. If Ethernet is not faster than WiFi, check whether the cable is Cat5e or better, whether the router port supports gigabit, and whether the adapter is limited to 100 Mbps.
When WiFi Is the Better Choice
Ethernet is technically stronger, but WiFi can still be the better practical choice for phones, tablets, renters, and rooms where cable routing would be messy or unsafe. A modern WiFi 6 router in the same room can easily handle streaming, browsing, and casual gaming. The tradeoff is not "WiFi bad, Ethernet good"; it is convenience versus consistency.
A good rule is simple: wire anything that stays in one place and matters during interruptions. That usually means desktop PCs, gaming consoles, workstations, NAS devices, and streaming boxes. Leave mobile devices and low-bandwidth smart home gear on WiFi.
π Compare Your WiFi vs Wired Speed
Run the speed test on your WiFi device, then again after connecting via Ethernet. See the real difference.
Start Speed Test