You have gone from 100 Mbps to 500 and everything feels exactly the same. This is one of the most common disappointments in home networking, and the reason is straightforward: the line is rarely the slowest part of the chain, and upgrading it only helps if it was.
The short answer
Test with a computer connected by ethernet directly to the router. That number is what your line is actually delivering. If it matches your new plan and your Wi-Fi does not, the bottleneck is inside your house, and no plan upgrade will ever fix it. The usual culprits are an old router, an old wireless adapter in the device, and Wi-Fi coverage.
The chain, and where speed gets lost
- The line into the house. What you pay for.
- The modem or router’s WAN port. An older router may have a 100 Mbps port, which caps you at 100 no matter what you buy.
- The router’s processing. Older routers cannot route at high speeds, particularly with security features or QoS enabled.
- The Wi-Fi radio. An older standard has a hard ceiling well below modern plan speeds.
- Distance and walls. Wi-Fi speed falls off sharply with both.
- The device’s own adapter. An old laptop may cap at 70 Mbps regardless of everything else.
Your real speed is whatever the slowest link allows. Upgrading step one when the constraint is step four changes nothing.
Test on ethernet directly into the router
This is the measurement that matters. If it shows roughly your plan speed, the line and the router WAN side are fine, and everything else is inside your house.
Check the ethernet link speed
On the laptop, look at the adapter’s negotiated speed. If it says 100 Mbps, your cable or the port is the limit and the test result is meaningless. Fix that before drawing conclusions.
Check the router's WAN port rating
Older routers have 100 Mbps WAN ports. If yours does, you are capped at 100 whatever you pay for, and a new router is the only fix. This catches a lot of people upgrading from older plans.
Test Wi-Fi standing next to the router
Compare with the ethernet figure. A large gap right beside the router means the router’s wireless is the limit, not your coverage.
Test Wi-Fi where you actually use devices
Now you have three numbers: the line, Wi-Fi at the router, and Wi-Fi where you sit. The biggest drop between any two tells you what to fix.
Check what your devices can actually do
An older laptop or tablet may have a single-antenna 2.4 GHz adapter with a real-world ceiling around 70 Mbps. No network change lifts that. A cheap USB adapter does.
Check the router is not throttling itself
Some routers slow down significantly when QoS, parental controls or built-in security scanning are enabled, because the processor cannot keep up. Turn them off temporarily and retest.
Ask whether the provider actually provisioned the upgrade
Occasionally the plan changes on the billing system and not on the line. If ethernet directly into the router still shows your old speed, that is a call to make, and it is worth making early.
Use the same device, in the same spot, at the same time of day for every test, and repeat each one three times. Speed test results vary enough that a single measurement proves very little, and comparing a phone in the bedroom against a laptop in the study tells you nothing useful.
What each Wi-Fi generation can realistically do
- Wi-Fi 4: realistically 50 to 100 Mbps. Anything faster is wasted.
- Wi-Fi 5: 200 to 400 Mbps close to the router, much less further away.
- Wi-Fi 6: 400 to 800 Mbps close in, and better at handling many devices.
- Wi-Fi 7: higher again, though few home uses need it.
These are real-world figures, not the numbers on the box, which assume ideal conditions and add every band together. If your router is Wi-Fi 5 and you have bought a gigabit plan, the router is your ceiling and you will never see the difference over wireless.
Before buying a new router, check whether your provider’s box needs specific settings or credentials that a third-party router will also need. Some connections require particular configuration, and it is better to find that out before the old router is unplugged.
When faster broadband genuinely helps
It is worth being clear that some upgrades are useful. More speed helps when several people stream 4K simultaneously, when you upload large files regularly, when large downloads are frequent, or when your old plan was genuinely saturating. It does not help with web browsing responsiveness, video calls, or gaming latency, all of which are limited by other things entirely.
For most households, better Wi-Fi coverage and smart queue management on the router improve daily experience far more than a faster line does.
Why is my Wi-Fi slower than my broadband speed?
Wi-Fi has its own ceiling set by the standard, the distance and the walls. It is almost always the slowest link in the chain, which is why ethernet testing is the only way to measure your line.
Do I need a new router after upgrading my plan?
If the router has a 100 Mbps WAN port, or only supports Wi-Fi 5 and you have bought a gigabit plan, yes. Test on ethernet first to find out which part is limiting you.
Why does my phone get faster speeds than my laptop?
Newer phones often have better wireless adapters than laptops a few years old. The device’s own hardware sets a ceiling that nothing on the network can lift.
Is a gigabit plan worth it?
For most households, no. Better Wi-Fi coverage and smart queue management improve the daily experience far more. A gigabit plan helps if several people stream 4K at once or you move large files regularly.
Does QoS slow down my router?
On older routers with weak processors, noticeably, because the extra work exceeds what the hardware can do at high speeds. On a capable router the cost is small and the benefit is large.
The bottom line
Measure on ethernet directly into the router, because that is the only number that reflects your line. Then compare Wi-Fi beside the router and Wi-Fi where you sit, and the biggest drop tells you what to fix. Check the router’s WAN port rating and its Wi-Fi generation before assuming the provider has let you down, since an old router quietly caps everything behind it.
