Why is my restaurant WiFi slow?

What you need

• A smartphone (yours or a manager’s).
• About 20 minutes during a normal service, plus a few minutes at your busiest hour.
• Access to the room where your internet box and router live (often an office, a closet, or a shelf behind the bar).
• If you have one, a laptop and a network cable for one wired test.

Usual causes

One consumer router doing everything

Many restaurants run on the WiFi router their internet provider handed them, or one store-bought router on a shelf in the back office. Those are built for a household, not 60 guests, a dozen staff phones, and a kitchen full of equipment. When the room fills up, it simply runs out of room to talk to everyone.

The kitchen is a tough place for WiFi

Commercial kitchens are full of stainless steel, walk-in coolers, and appliances. Metal and dense walls block and reflect WiFi signals, and microwaves can interfere with the older 2.4 GHz WiFi band. A router tucked behind the kitchen often leaves the dining room with a weak signal.

Too many devices on one WiFi name

Every phone, tablet, and terminal on a WiFi network has to take turns on the air. When too many devices share the same channel, everything slows down, drops, or lags. Ubiquiti calls this high airtime utilization, and it’s especially common in crowded rooms and busy plazas where neighboring businesses have their own WiFi on the same channels (Ubiquiti on airtime utilization).

Guests and the POS on the same network

If guests, staff phones, and your POS all join the same WiFi, a guest streaming video competes directly with a card payment. It’s also a security problem: anyone with the guest password is on the same network as your registers.

Old access points that only speak 2.4 GHz

Older equipment may only use the 2.4 GHz band. It reaches far, but it’s crowded and slow. Newer access points also offer 5 GHz (and sometimes 6 GHz), which carry much more traffic in a busy room. Ubiquiti notes that 2.4 GHz is more prone to congestion and poor performance (Ubiquiti on WiFi connectivity and latency).

The internet is fine, but the WiFi isn’t

This one surprises people. You may already pay for a fast internet plan, and it may be working perfectly. The slowdown happens between the router and the guest’s phone. Upgrading your plan won’t fix a WiFi problem.

What “good” looks like

A restaurant network that holds up on a busy Saturday usually has these pieces:

• A separate guest network. Guests get internet and nothing else. They can’t see your POS, cameras, office computer, or each other. On UniFi, that’s a guest network with Network Isolation turned on, plus Client Device Isolation on the guest WiFi (Ubiquiti guest WiFi best practices; isolation overview). Optional speed limits per guest keep one big upload from slowing everyone else.
• Business WiFi for POS and staff. Card terminals, kitchen displays, and order tablets get their own network with its own password that guests never see. Staff personal phones go on guest WiFi or their own staff network, not the POS network.
• Coverage where people actually sit. Business-grade access points mounted in the dining room, bar, and patio, ideally connected by cable rather than relying on a single box in the back office.
• A documented handoff. A one-page summary of the network names, what each is for, where the equipment lives, and who to call. When a manager leaves or the POS company calls, you’re not guessing.

Caution

• Don’t share your POS or office WiFi password with guests “just for tonight.” Once it’s out, it’s out. Change it if it has been shared.
• Don’t assume a faster internet plan will fix slow WiFi. Run the wired vs. WiFi test first.
• Be careful with cheap WiFi extenders. They can add coverage, but each wireless hop cuts speed, and they often make crowded rooms worse.
• Check with your POS provider before moving terminals to a new network. Some systems need specific settings to keep processing cards.
• Make changes outside of service hours. A WiFi change at 6:30 on a Friday is a bad night for everyone.