“Just use a cable” is the most repeated advice in gaming forums, and it's basically right — but the honest picture is more interesting than “Wi-Fi bad”. Modern Wi-Fi is dramatically better than what most people remember, and for plenty of play it's genuinely fine. Here's where the cable still wins, by roughly how much, and what to do when you can't run one.
What actually differs: latency, jitter, consistency
For gaming, raw throughput is almost irrelevant — gameplay traffic is tiny. What matters is how quickly and how consistently packets get through. Ethernet is a dedicated, full-duplex wire: it adds well under a millisecond and essentially zero jitter. Wi-Fi is a shared radio channel where your device must contend for airtime with every other device (and neighbour) on the channel, retransmit through interference, and occasionally pause while it scans. That contention is where latency spikes come from.
Rough, real-world expectations by generation
- Ethernet: adds <1 ms, jitter near zero. The reference point.
- Wi-Fi 4 (802.11n): the old 2.4 GHz workhorse — typically adds somewhere in the region of 10–30 ms with frequent spikes on busy channels. Avoid for competitive play.
- Wi-Fi 5 (802.11ac): on a clean 5 GHz channel, commonly adds a few milliseconds to ~10 ms, with occasional jitter spikes under load.
- Wi-Fi 6 / 6E (802.11ax): with a strong signal — often just 1–5 ms added, and 6E's uncongested 6 GHz band makes spikes rarer still. The gap to Ethernet has narrowed a lot.
Treat these as typical ranges, not lab guarantees — your channel congestion, signal strength and router quality move the numbers. The constant across all generations: Wi-Fi's average can look great while its worst moments are what you feel as a teleporting opponent.
When Wi-Fi is genuinely fine
- Single-player and casual co-op games — latency barely matters.
- Turn-based and slower MMO content.
- Console gaming on Wi-Fi 6 with the router in the same or adjacent room.
- Game downloads — modern Wi-Fi has throughput to spare; see our Wi-Fi speed guide if downloads are slower than your plan.
When only a cable will do
- Competitive shooters and fighting games, where a single 50 ms spike at the wrong moment decides the round.
- Cloud gaming (GeForce Now, Xbox Cloud), which turns every jitter spike into visible input lag and artefacts.
- Streaming your gameplay while playing — sustained upload plus low jitter is exactly Wi-Fi's weak spot.
- Anywhere the signal is already marginal: a weak link retransmits constantly, and jitter balloons.
The middle options: powerline and MoCA
Can't run a cable across the house? Two technologies reuse wiring you already have. Powerline adapters send data over mains electrical wiring — cheap and easy, but performance depends heavily on your home's wiring, and real-world speeds are often a fraction of the box's claim. Still, a mediocre-but-steady powerline link frequently beats jittery Wi-Fi for gaming. MoCA runs over coaxial TV cabling and is the sleeper pick: where coax sockets exist in the right rooms, MoCA delivers near-Ethernet speeds with low, stable latency. If your home has coax runs, check MoCA before buying a mesh system.
Measure it, don't guess
- Run a NetStartr test on Wi-Fi from your gaming spot. Note ping, jitter and the stability score — not the download number.
- Plug the same machine into the router with a cable and re-test.
- Compare jitter. If Wi-Fi jitter is already under ~5 ms, a cable will buy you little. If it's 15 ms+, the cable (or MoCA) is your upgrade.
For target numbers by game genre, see what is a good jitter for gaming, and for the full diagnosis flow when ping is high, start with the gaming speed test.