BackWhy Is My WiFi So Slow? Causes and Proven Fixes
Slow WiFi affects streaming, gaming and work. This guide covers the most common causes of slow internet, how to test and check your WiFi speed, what good speeds look like, and 10 step-by-step fixes to increase your WiFi speed today.
How This Guide Helps You
Diagnose the Problem
Pinpoint exactly why your WiFi is slow with a structured troubleshooting approach
Test Your WiFi Speed
Learn how to check your WiFi speed accurately and understand what the results mean
Fix your WiFi Step by Step
Follow 10 proven fixes to increase your WiFi speed, from quick wins to long-term upgrades
WiFi Speed vs. Coverage: What's the Difference?
Before troubleshooting, it is important to identify the root cause of your issue.
WiFi Speed
The "Water Flow": How fast data moves to your device. This guide fixes slow downloads, buffering, and lag.
WiFi Coverage
The "Pipes": Whether the signal even reaches your room. If you have "dead zones," check out our other guide.
Why Is My WiFi So Slow?
Slow WiFi in Singapore usually comes down to 1 of 4 causes. Identifying which one applies to you is the fastest way to fix it.
Not sure which one applies to you?
The next section shows you how to test your speed so you know exactly where the problem is.
How to Check and Test Your WiFi Speed?
Run a speed test before trying any fixes.
It takes 30 seconds and tells you whether the problem is your WiFi, your device, or your broadband plan.
Method 1
Use a Speed Test Website
StarHub users: On speedtest.net, tap the server name and switch to "StarHub". This tests your connection directly against StarHub's network for the most accurate result.
What Do the Numbers Mean?
Pro tip: Stop all downloads and close other apps before testing. For the most accurate reading, run a wired speed test by plugging an Ethernet cable directly into your router. If wired speed is fast but WiFi is slow, the problem is your WiFi setup, not your broadband plan.
Method 2
Use a Mobile App (Best for Room-by-Room Testing)
Download Speedtest by Ookla (free on iOS and Android). Run the test next to your router for a baseline, then walk to each room and test again. This shows you exactly where your WiFi weakens.
Pro tip: Run 3 tests and use the average. Close other apps and stop any downloads first so nothing else eats into the result.
What Is a Good WiFi Speed in Singapore?
A good WiFi speed is one where nothing buffers, lags, or drops, no matter what everyone in the home is doing at the same time. In Singapore, we have the fastest fixed broadband in the world - even mid-tier fibre plans here outpace what most countries offer at their top tier. The bottleneck is rarely the plan itself, but how that speed is shared.
The more useful question is whether your plan has enough headroom for your device load.
Pro Tip:
Most households underestimate their device count. Before deciding, open your router app and count device - smart TVs, security cameras, and even robot vacuums consume bandwidth in the background. The number is almost always higher than expected.
How to
Increase Your WiFi & Internet Speed?
These take less than 5 minutes and solve the problem for most people.
🔄 Restart Your Router
Unplug your router from power. Wait 30 seconds. Plug it back in and wait 1 to 2 minutes for it to reconnect.
Why this works: Routers build up temporary glitches over time, like a computer that has been running for weeks without a restart. Power cycling clears these out and gives it a fresh start.
📵 Close Apps Running in the Background
Apps like Google Drive, iCloud, Dropbox, and software updaters quietly download and upload data even when you are not using them. Close what you do not need, especially on phones and tablets.
Why this works: Background uploads are invisible bandwidth hogs. Closing them instantly frees up speed for the things you are actively doing.
📶 Switch to Your 5 GHz Network
Most routers broadcast 2 WiFi networks: 1 on 2.4 GHz and 1 on 5 GHz. You will usually see them in your WiFi list as something like "MyWiFi" and "MyWiFi_5G". Connect to the 5G version on the devices you use most (laptop, phone, smart TV).
Why this works: The 2.4 GHz network is crowded. In an HDB or condo, dozens of your neighbours' routers are on the same 2.4 GHz channel, and they all interfere with each other. 5 GHz is less crowded and much faster. The tradeoff is shorter range, so it works best when you are in the same room or 1 room away from your router.
🧹 Clear Your Browser Cache
Your browser stores old website data to load pages faster, but over time this stored data gets bloated and slows things down. In Chrome: Settings > Privacy and Security > Clear Browsing Data. In Safari: Preferences > Privacy > Manage Website Data > Remove All.
Tried all of these and still slow?
Keep reading. The next section covers fixes that take a bit more effort but solve deeper problems.
More Ways to
Increase Your WiFi & Internet Speed
If the quick fixes did not solve it, these go deeper.
📍 Move Your Router to a Better Spot
WiFi signals get weaker every time they pass through a wall, door, or piece of furniture. If your router is tucked in a corner or hidden inside a cabinet, it is working harder than it needs to.
After moving it: Run a speed test in each room to see if the weak spots have improved.
🔗 Plug Your Most Important Device In with a Cable
If you have a desktop, gaming console, or work laptop near the router, connect it with a network cable instead of using WiFi. A wired connection is always faster and more stable because it skips all the wireless interference.
Which cable?
Look at the small text printed on the cable itself. Cat5e supports speeds up to 1 Gbps. Cat6 or Cat6a supports up to 10 Gbps. If you are on a fast broadband plan and using an old cable, the cable might be your bottleneck.
Bonus:
Plugging in even 1 device takes it off the WiFi network entirely, freeing up wireless bandwidth for your phones and tablets.
🔒 Check If Unknown Devices Are Using Your WiFi
Log in to your router's settings page (usually by typing 192.168.1.1 in your browser). Look for a "Connected Devices" or "Client List" section. If you see devices you do not recognise, someone else is using your WiFi and taking a share of your speed.
Fix it:
Change your WiFi password. In dense housing like HDB blocks and condos, this is more common than you would expect.
⬆️ Update Your Router's Software
Routers run their own software (called firmware), and manufacturers release updates to fix bugs and improve performance. Log in to your router's settings page or app and check for updates. Restart the router after updating.
Good to know:
Many newer routers update themselves automatically. But if yours is a few years old, it is worth checking manually.
🌐 Speed Up How Websites Load (Change Your DNS)
Every time you visit a website, your device looks up its address using something called DNS. Think of it like a phone directory for the internet. The default directory your device uses is sometimes slow. Switching to a faster 1 makes websites and apps start loading quicker.
Note:
This will not make your download speed faster. It speeds up the moment before data starts flowing, so pages and apps feel snappier to open.
Still Slow? How to Find the Right Fix
If you've tried the fixes above and WiFi speed is still a problem, use this to narrow down the culprit.
The Router is the Weak Link
Symptoms: WiFi is slow but wired speed is fast. Multiple devices lag at once, or your router is 3+ years old.
What to do: Upgrade to a WiFi 6 or WiFi 7 router to handle more devices at higher speeds.
The Plan is the Ceiling
Symptoms: Both wired and WiFi are slow. Your speed test results are already close to your plan’s maximum.
What to do: Upgrade to a faster Fibre plan. No amount of hardware tweaking can push you past your plan's limit.
Coverage Problem, Not Speed
Symptoms: Speed is perfect near the router but drops significantly in bedrooms, the kitchen, or hallways.
What to do: Add a Mesh WiFi system to eliminate dead zones. See our WiFi coverage guide for options.
Peak-Hour Network Congestion
Symptoms: Speed is fine during the day but drops consistently in the evenings (7 pm – 11 pm).
What to do: Use the 5 GHz band, or switch to a higher-tier UltraSpeed plan for more headroom.
Frequently Asked Questions
Older devices use older WiFi technology, which limits their speed. If your phone is fast but your laptop is slow, the laptop is the bottleneck. Try testing speed on a few different devices to confirm.
A strong signal does not always mean fast internet. This usually means too many devices are sharing the connection, or your neighbours' WiFi is interfering with yours. Try the wired test from the section above to narrow it down.
They fix different problems. Mesh WiFi fixes coverage (signal dropping in far rooms). A faster plan fixes speed (everything is slow everywhere). If speed is fine near the router but bad in other rooms, go mesh. If speed is bad everywhere, go for a plan upgrade.
Plug a device directly into your router with a cable and run a speed test. If wired speed is much faster than WiFi, your router is the weak link. Routers older than 3 to 4 years typically struggle with many devices and do not support the latest WiFi standards.
A good speed is 1 where nobody in your home experiences buffering or lag. For most Singapore households with multiple people and 10+ devices, a fibre plan of 3 Gbps or above provides enough room for everyone to use the internet comfortably at the same time.
2.4 GHz reaches further but is slower and more crowded (especially in flats where many neighbours share the same channel). 5 GHz is faster and less crowded but does not reach as far. Connect to 5 GHz when you are within a room or 2 of your router. For a deeper explanation, see our frequency bands guide.
Upgrade to Faster WiFi with StarHub
If your broadband plan or router is the limit, StarHub UltraSpeed Fibre Broadband gives your household the speed to stop worrying about WiFi.
Disclaimer:
This content is provided for general information and convenience. While we take care in preparing our articles, readers should refer to official sources or professional advice for specific, up-to-date details.
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