Look, we've all read those generic POS system reviews that tell you everything except what you actually need to know: which system won't crash when you've got 30 hungry customers waiting and your kitchen printer's spitting out tickets like there's no tomorrow.
So we did something different. We partnered with a busy London café (shout out to The Daily Grind in Shoreditch) and tested five popular restaurant POS systems during their peak lunch service. We're talking proper testing here: not some staged demo with fake orders.
The results? Let's just say two systems nearly got thrown out the window.
How We Actually Tested These Systems
Between 12:00 and 14:00 on a Friday afternoon, we ran each POS system through its paces. We tracked:
- Order processing speed (from customer ordering to kitchen ticket printed)
- Payment processing time (contactless, chip & PIN, and Apple Pay)
- System crashes or freezes (the big one)
- Staff learning curve (how quickly our barista picked up each system)
- Table turnover impact (because time is literally money)
Each system handled roughly 45-60 transactions during a two-hour window. We used identical hardware where possible and tested on the restaurant's actual Wi-Fi network (which, spoiler alert, matters more than you'd think).
The Speed Test Results: Numbers That Actually Matter
Here's what we found, ranked by overall transaction speed:
1. Epos Now – Average transaction time: 18 seconds (order to receipt printed)
2. Square POS – Average transaction time: 22 seconds
3. Toast POS – Average transaction time: 24 seconds
4. SumUp – Average transaction time: 28 seconds
5. Shopify POS – Average transaction time: 31 seconds
But here's the thing: raw speed isn't everything. System crashes, confusing menus, and slow payment processing can completely kill your service flow.
System #1: Epos Now (Our Top Pick)
Transaction Speed: 18 seconds average
Crashes During Test: 0
Staff Training Time: 15 minutes
Epos Now absolutely smashed this test, and honestly, we weren't that surprised. The system handled everything we threw at it: split bills, modifications (no onions, extra cheese, that sort of thing), and table transfers without breaking a sweat.
What really impressed us was the kitchen display integration. Orders appeared on the KDS in under 3 seconds, which is crucial when you're running a tight kitchen. The barista learned the system faster than any other we tested, mainly because the interface is dead simple: big buttons, logical menu structure, no hunting through submenus.
The contactless payments were lightning quick too. We're talking tap-and-go in under 5 seconds, which adds up massively over a lunch rush. According to the National Restaurant Association, reducing transaction time by just 10 seconds can increase daily revenue by 5-8% in quick-service settings.
Epos Now also didn't slow down when the Wi-Fi got dodgy (which it did around 13:15). The offline mode kicked in seamlessly, and orders kept flowing. When connection restored, everything synced up automatically.
Price: From £25/month + hardware costs
Best For: Independent restaurants, cafés, and quick-service spots that need reliability above all else
If you're serious about finding a system that won't let you down when it counts, definitely check out our full Epos Now review. We've covered pricing, integrations, and real user experiences in detail.
System #2: Square POS
Transaction Speed: 22 seconds average
Crashes During Test: 0
Staff Training Time: 20 minutes
Square came in as a strong second place. The iPad-based system looks slick and handled the lunch rush without any crashes, which is more than we can say for some others (we'll get to that).
Payment processing was solid: contactless payments took about 6-7 seconds, and the built-in receipt printer kept up nicely. Where Square really shines is its reporting. Even during service, we could see live sales data updating, which is brilliant for keeping tabs on your busiest items.
The slight slowdown compared to Epos Now came from the menu navigation. Modifiers require an extra tap, and during peak times, those extra taps add up. Our barista also mentioned the smaller button size made it easier to mis-tap when rushing.
Price: Free software + hardware costs (2.5% transaction fees)
Best For: Smaller cafés and food trucks that want minimal upfront costs
System #3: Toast POS
Transaction Speed: 24 seconds average
Crashes During Test: 1 (minor, recovered in 30 seconds)
Staff Training Time: 35 minutes
Toast is built specifically for restaurants, and you can tell. The kitchen management features are top-notch: course firing, prep times, all that good stuff. But it's also more complex, which showed in our testing.
The system had one brief freeze when processing a split bill between four customers. It recovered quickly, but that 30-second pause during lunch rush? Not ideal. The learning curve was also steeper: our barista needed proper training time to feel confident.
That said, if you're running a full-service restaurant with complex orders, Toast's features might justify the extra complexity. The online ordering integration worked beautifully, with orders flowing straight into the kitchen system.
Price: From £69/month + hardware
Best For: Established restaurants with complex menu structures
System #4: SumUp
Transaction Speed: 28 seconds average
Crashes During Test: 0
Staff Training Time: 25 minutes
SumUp is the budget option here, and it shows in the speed tests. Don't get us wrong: it's reliable and didn't crash once. But the slower processing times became noticeable during the lunch rush.
The main bottleneck? Receipt printing. For some reason, there's a 3-4 second delay between payment confirmation and the receipt actually printing. When you're serving 30+ customers in two hours, those delays stack up.
That said, if you're just starting out and cash flow is tight, SumUp gets the job done. We've covered SumUp's transaction fees in detail if you want to understand the true cost.
Price: No monthly fee, 1.69% transaction fee
Best For: New cafés and pop-ups with tight budgets
System #5: Shopify POS
Transaction Speed: 31 seconds average
Crashes During Test: 2
Staff Training Time: 30 minutes
Shopify POS is brilliant if you're running a retail shop with a café attached. But as a dedicated restaurant system? It struggled during our test.
We had two system freezes: one during a busy moment with six orders queued, and another when processing a card payment. Both times we had to restart the app, which meant customers waiting. Not good.
The inventory management is excellent (as you'd expect from Shopify), but the restaurant-specific features feel like an afterthought. Modifiers are clunky, there's no proper table management, and the kitchen ticket printing was the slowest of all systems tested.
Price: From £29/month + transaction fees
Best For: Retail shops with a small café component, not dedicated restaurants
What These Results Actually Mean for Your Restaurant
Here's the thing: a 10-second difference in transaction time might not sound like much. But let's do the maths:
If you serve 200 customers during lunch service, and your POS system is 10 seconds slower per transaction, that's 2,000 seconds (33 minutes) of lost time. That could be 10-15 additional customers served.
Over a year? We're talking thousands of pounds in lost revenue, just because your POS system is sluggish.
Beyond speed, system reliability matters even more. One crash during lunch rush can cost you multiple table turnovers and create a backlog that takes the entire afternoon to clear.
Our Honest Recommendation
For most UK restaurants, cafés, and quick-service spots, Epos Now is the clear winner. The combination of speed, reliability, and ease of use is hard to beat. The fact that it didn't crash once during our testing speaks volumes.
If you're on a super tight budget, SumUp will do the job: just accept you'll be a bit slower. And if you're running a complex full-service restaurant with multiple courses and elaborate menus, Toast might be worth the extra complexity.
Want to see how these systems stack up in other areas? Check out our comprehensive POS system comparison for UK businesses or our detailed Epos Now vs SumUp vs Shopify comparison.
The Bottom Line
Your POS system can make or break your lunch service. We've now seen firsthand which systems can actually handle the pressure and which ones buckle.
If you're serious about finding a system that'll keep up with your busiest services, book a demo with Epos Now. Tell them you saw our speed test results: they offer free trials so you can test it in your own restaurant before committing.
Because at the end of the day, the best POS system isn't the one with the most features: it's the one that actually works when you need it most.