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Few things kill productivity faster than slow internet. Whether you're trying to join a video call, upload documents, access cloud software or simply load a webpage, a sluggish connection can bring your business to a grinding halt.
The good news is that most slow internet issues are fixable, often with a few simple checks.
In this guide, Telanova explains the most common causes of slow office internet, what may be happening behind the scenes, and how you can get your connection back up to speed.
Why Slow Internet Costs Businesses Money
Slow internet is more than just frustrating. It can affect productivity, customer service and ultimately your bottom line.
Common business impacts include:
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Dropped Microsoft Teams and Zoom calls
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Slow access to cloud-based applications
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Delayed file uploads and downloads
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Poor VoIP phone call quality
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Reduced employee productivity
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Customer service delays
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Interrupted online transactions
For businesses that rely on cloud software and online communications, even small performance issues can quickly become costly.
First Test Your Internet Speed
Before troubleshooting, it's important to understand your current connection performance.
Use an online speed checker such as Ookla Speedtest to measure:
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Download speed
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Upload speed
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Ping (latency)
Download and upload speeds show how much bandwidth is available, while latency measures how quickly data travels between your device and the internet. Generally speaking, higher bandwidth and lower latency provide a better experience.
Typical Broadband Speeds
| Connection Type | Typical Download Speed |
|---|---|
| ADSL (Standard Broadband) | 10–24 Mbps |
| FTTC (Part Fibre) | 30–80 Mbps |
| Cable Broadband | 50 Mbps–2 Gbps+ |
| FTTP (Full Fibre) | 50 Mbps–3 Gbps+ |
| 5G Broadband | 80–210+ Mbps |
Actual speeds will vary depending on location, network congestion, equipment and the number of connected devices.
1. Your Router or Modem Needs a Restart
It sounds simple, but restarting your networking equipment remains one of the most effective fixes for slow internet.
Over time, routers can develop temporary faults or connection issues that affect performance.
Signs this may be the problem
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Internet was previously working well
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Speeds fluctuate throughout the day
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All devices are affected
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The connection occasionally drops
Quick Fix
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Unplug your router and modem.
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Wait 30 seconds.
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Plug them back in.
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Allow 2–3 minutes for everything to reconnect.
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Retest your internet speed.
2. Wi-Fi Signal Weakness or Interference
Even if your broadband connection is fast, poor Wi-Fi coverage can create slow speeds.
Walls, distance from the router, metal objects, neighbouring networks, microwaves and cordless phones can all interfere with wireless signals.
Quick Fixes
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Place your router in a central location.
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Position it higher off the ground.
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Avoid placing it behind furniture or inside cupboards.
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Keep it away from metal objects and electrical appliances.
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Use the 5GHz band where available.
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Use a Wi-Fi analyser to check signal strength.
Retest your connection speed after making changes.
3. Network Congestion: Too Many Devices
Modern offices often have dozens of connected devices, including laptops, mobile phones, printers, CCTV systems, smart devices and cloud-based applications.
When too many devices compete for bandwidth at the same time, performance can suffer.
Quick Fixes
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Disconnect unused devices.
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Schedule large downloads outside business hours.
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Enable Quality of Service (QoS) settings to prioritise critical applications such as VoIP and video conferencing.
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Review whether your current broadband package is sufficient for your team size.
Retest your connection speed.
4. Outdated or Underpowered Hardware
Older routers, switches and wireless access points may not be capable of supporting modern broadband speeds or the demands of a busy workplace.
Many older devices still use outdated Wi-Fi standards that can become a bottleneck.
Quick Fix
Upgrade to modern business-grade networking equipment designed to support multiple users, cloud applications and high-performance internet connections.
Retest your connection speed.
5. Damaged or Loose Network Cables
Faulty cabling is often overlooked but can cause significant performance issues, including reduced speeds and intermittent dropouts.
Signs this may be the problem
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Random disconnections
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Speeds vary significantly
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Problems affect specific devices only
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Network issues occur when cables are moved
Quick Fix
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Check Ethernet and broadband cables for damage.
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Replace worn or damaged cables.
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Ensure all connections are secure.
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Test with a known working cable if possible.
Retest your connection speed.
6. High Latency or Poor Network Routing
Sometimes the issue isn't bandwidth at all, but latency.
High latency can affect:
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Microsoft Teams calls
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Zoom meetings
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VoIP phone systems
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Remote desktop connections
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Cloud applications
Even with high download speeds, a high latency connection can feel slow and unresponsive.
Quick Fixes
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Use a wired Ethernet connection where possible.
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Reduce unnecessary network traffic.
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Contact your ISP if latency remains consistently high across multiple devices.
Retest your connection speed.
7. Outdated or Overloaded Devices
If only certain devices are experiencing slow speeds, the problem may lie with the device itself.
Background applications, outdated software, insufficient memory or malware can all affect performance.
Quick Fixes
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Install operating system updates.
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Close unnecessary applications.
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Run antivirus and malware scans.
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Restart the device.
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Check available storage and memory.
Retest your connection speed.
8. External Interference and Neighbouring Wi-Fi Networks
In office buildings, industrial estates and apartment complexes, multiple Wi-Fi networks may compete for the same wireless channels.
This can cause congestion and reduce performance.
Quick Fixes
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Change to a less congested Wi-Fi channel.
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Use channels 1, 6 or 11 where appropriate.
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Upgrade to Wi-Fi 6 or newer technology.
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Consider installing additional wireless access points.
Retest your connection speed.
9. Your Broadband Package Is No Longer Fit for Purpose
Businesses often outgrow their broadband package without realising it.
As teams expand and more services move to the cloud, bandwidth requirements increase significantly.
Signs you may need an upgrade
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More staff working online
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Increased video conferencing
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Larger file transfers
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Cloud-based business systems
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VoIP phone systems
Quick Fix
Review your current package and compare it against your actual business requirements. A faster business broadband service may provide a significant improvement.
10. ISP Issues or Bandwidth Throttling
Sometimes the issue lies outside your premises.
Your internet provider may be experiencing:
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Network outages
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Local congestion
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Infrastructure faults
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Temporary service degradation
Quick Fixes
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Check your ISP's service status page.
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Run speed tests at different times of day.
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Compare results across multiple devices.
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Contact your provider if issues continue.
Is It Your Broadband or Your Wi-Fi?
One of the quickest ways to identify the source of the problem is to connect a laptop directly to your router using an Ethernet cable.
If speeds improve significantly
The broadband connection is likely fine and the issue is probably related to your Wi-Fi coverage or wireless interference.
If speeds remain poor
The issue may be with your broadband service, networking equipment or internet provider.
This simple test can save hours of troubleshooting.
When Home Broadband Equipment Isn't Enough
Many businesses start with consumer-grade networking equipment that was never designed for a busy office environment.
As organisations grow, networks often need to support:
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Multiple users
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VoIP phone systems
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Cloud applications
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Security cameras
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Guest Wi-Fi
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Remote workers
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Large file transfers
Business-grade networking equipment offers improved performance, reliability, security and traffic management to support modern business operations.
Frequently Asked Questions
Why is my internet fast on some devices but slow on others?
This often indicates a device-specific issue such as poor Wi-Fi reception, outdated hardware, software problems or excessive background activity.
What internet speed does a small business need?
Requirements vary, but many small businesses benefit from connections offering at least 50–100 Mbps. Businesses using cloud applications, VoIP systems and video conferencing may require significantly more.
Does restarting a router really help?
Yes. Restarting clears temporary faults, refreshes connections and often resolves common performance issues.
Why is my internet slow even with full Wi-Fi signal?
A strong Wi-Fi signal does not always mean a fast internet connection. The issue could be network congestion, ISP problems, latency or limitations elsewhere on the network.
Need Help Fixing Slow Office Internet?
If slow internet is affecting productivity, disrupting video calls or frustrating your team, Telanova can help.
We help businesses across Wokingham, Ascot, Bracknell, Reading and Berkshire identify and resolve connectivity issues, whether the problem lies with broadband performance, Wi-Fi coverage, networking equipment or internal infrastructure.
Our team can help with:
- Business broadband advice and upgrades
- Office Wi-Fi surveys and coverage improvements
- Network troubleshooting and performance optimisation
- Router, firewall and switch upgrades
- VoIP and Microsoft Teams connectivity issues
- Ongoing IT support and network monitoring
Whether your internet has suddenly become slow or your business has simply outgrown its current setup, we'll help identify the cause and recommend practical solutions that improve reliability, performance and productivity.
Call 01344 989 530 or contact Telanova to discuss your business connectivity requirements.
About Telanova
Telanova provides business IT support, networking, connectivity and communication solutions to organisations across the UK. Our team helps businesses improve performance, reliability and security through practical technology solutions.
