Speedify Helps Windows PC Wi-Fi Work Faster by Combining Wi-Fi and 4G/5G Cellular at Once
Want faster Wi-Fi on your Windows PC? Run Wi-Fi and a second internet connection at the same time. If the whole connection is slow on Windows 11, see why Windows 11 internet gets slow.
Speedify is an app that combines two or more internet connections at once, such as Wi-Fi and a phone’s 4G/5G cellular, so you get faster upload and download speeds and stay online if one connection drops out. This guide covers 11 Windows and router fixes that make Wi-Fi faster on a PC, then how combining connections goes further.
Speedify uses every internet connection your device has, at the same time
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Why Wi-Fi on a Windows PC Is Slow: The Most Common Causes
Slow Wi-Fi on a Windows PC is a common problem, and the cause is usually one of a handful of issues. Finding the actual cause first gets you to the right fix faster. These are the most common causes:
- Router distance and physical obstructions: Wi-Fi signal strength falls as distance grows. Walls, floors, large appliances, and furniture between a PC and the router reduce signal strength and throughput. A PC one room away from a router often gets a fraction of the speed a PC next to the router receives.
- Wi-Fi channel congestion: In apartments, offices, and dense residential areas, neighboring Wi-Fi networks compete for the same radio channels. Channel congestion causes interference that reduces the effective speed every device on the network receives.
- 2.4 GHz vs. 5 GHz band selection: Windows sometimes connects a PC to the 2.4 GHz band instead of the faster 5 GHz band, particularly when the PC is at the edge of 5 GHz range. The 2.4 GHz band is slower and more congested than the 5 GHz or 6 GHz bands.
- Outdated network adapter drivers: Windows Wi-Fi adapters require up-to-date drivers to perform reliably. Outdated or corrupted drivers cause connection instability, reduced throughput, and increased latency.
- Outdated router firmware: Router manufacturers release firmware updates that improve Wi-Fi performance, fix bugs, and patch security vulnerabilities. Routers running outdated firmware often underperform.
- Windows background processes consuming bandwidth: Windows Update, OneDrive sync, Microsoft Store app updates, and antivirus definition downloads all consume Wi-Fi bandwidth in the background, sometimes saturating the connection during active use.
- DNS server performance: Windows uses the DNS server assigned by the router by default. ISP-provided DNS servers are often slower than third-party alternatives, adding latency to every website request.
- Single connection dependency: Every Windows PC running on Wi-Fi alone is fully dependent on that one connection. When Wi-Fi slows down or drops, every application on the PC is affected with no alternative path for traffic. Running Wi-Fi and 5G cellular at the same time gives the PC that second path.
How to Make Wi-Fi on a Windows PC Faster: Windows Settings Fixes
Fix 1: Forget and Reconnect to the Wi-Fi Network
Windows stores Wi-Fi network profiles that can become outdated or corrupted. Forgetting a network and reconnecting forces Windows to establish a clean connection with fresh DHCP settings and channel selection.
- Open Settings → Network & Internet → Wi-Fi → Manage Known Networks.
- Click the network the PC is connected to and select Forget.
- Reconnect to the Wi-Fi network by selecting it from the list and entering the password.
Fix 2: Renew the IP Address (Release and Renew DHCP Lease)
A stale DHCP lease can cause routing issues that slow down Wi-Fi performance on a Windows PC without producing any visible error. Releasing and renewing the IP address forces the router to assign a fresh address and network configuration.
- Open Command Prompt as Administrator (search for “cmd”, right-click, Run as administrator).
- Type
ipconfig /releaseand press Enter. - Type
ipconfig /renewand press Enter.
Fix 3: Switch to a Faster DNS Server
Replacing the ISP-assigned DNS server with a faster third-party alternative reduces the time it takes for Windows to resolve domain names, which improves the perceived speed of every website and cloud service the PC connects to.
- Open Control Panel → Network and Internet → Network Connections.
- Right-click the Wi-Fi adapter and select Properties.
- Select Internet Protocol Version 4 (TCP/IPv4) and click Properties.
- Select “Use the following DNS server addresses” and enter 1.1.1.1 (Cloudflare) as the preferred DNS and 1.0.0.1 as the alternate DNS.
- Click OK to apply.
Fix 4: Force the PC to Connect to the 5 GHz or 6 GHz Band
If the router broadcasts separate network names for 2.4 GHz and 5 GHz bands, connect the PC explicitly to the 5 GHz network. Alternatively, configure the Wi-Fi adapter to prefer 5 GHz in Device Manager → Network Adapters → right-click the Wi-Fi adapter → Properties → Advanced → Preferred Band → set to “Prefer 5 GHz band”.
Fix 5: Flush the Windows DNS Cache
A corrupted DNS cache causes slow or failed domain resolution on a Windows PC. Flushing the cache forces Windows to perform fresh DNS lookups for all domains.
- Open Command Prompt as Administrator.
- Type
ipconfig /flushdnsand press Enter.
Fix 6: Update the Wi-Fi Adapter Driver
Outdated or corrupted Wi-Fi adapter drivers cause speed and stability issues that no router-side fix can resolve. Open Device Manager → Network Adapters → right-click the Wi-Fi adapter → Update Driver. Alternatively, download the latest driver directly from the PC or adapter manufacturer’s website (Intel, Qualcomm, Realtek, or the PC brand’s support page).
Fix 7: Turn Off Delivery Optimization Uploads in the Background
Windows includes features that consume Wi-Fi bandwidth in the background. Delivery Optimization allows Windows to upload Windows Update files to other PCs on the local network and internet, consuming upload bandwidth. Disable it in Settings → Windows Update → Advanced Options → Delivery Optimization → Allow Downloads from Other PCs (set to Off or limit to Local Network only).
How to Make Wi-Fi on a Windows PC Faster: Router and Hardware Fixes
Fix 8: Move the Router or the PC
Position the router in a central, elevated location with clear line of sight to the areas where the PC is used most frequently. Every wall, floor, and large object the Wi-Fi signal passes through reduces signal strength. Moving the router even a few meters can make a noticeable difference to the speed the PC receives.
Fix 9: Change the Router’s Wi-Fi Channel
Most routers select a Wi-Fi channel automatically, but automatic channel selection often results in the router using the same channel as several neighboring networks. Log into the router’s admin interface and manually select a less congested channel. For 2.4 GHz networks, channels 1, 6, and 11 are the only non-overlapping options. For 5 GHz networks, a wider range of non-overlapping channels is available, with less interference in most environments.
Fix 10: Update Router Firmware
Check the router manufacturer’s website or the router’s admin interface for available firmware updates. Firmware updates frequently include Wi-Fi performance improvements, bug fixes for connection stability issues, and security patches.
Fix 11: Use a Wi-Fi Analyzer to Identify Interference
Free tools like Wi-Fi Analyzer (available in the Microsoft Store) scan nearby networks and display signal strength, channel utilization, and congestion data. Use the results to identify the least congested channels in the local environment and configure the router accordingly.
What Each Windows Wi-Fi Fix Improves and How Much
| Fix | What It Improves | Typical Impact |
|---|---|---|
| Switch to 5 GHz or 6 GHz band | Download and upload throughput | High: usually faster than 2.4 GHz at short range |
| Switch to Cloudflare DNS (1.1.1.1) | Page load times, app response speed | Medium: shorter DNS lookup times |
| Change Wi-Fi channel | Throughput, connection stability | Medium to High in congested environments |
| Move router closer / reposition | Signal strength, throughput | High: signal strength drops sharply with distance |
| Update Wi-Fi adapter driver | Connection stability, throughput | Medium: fixes driver-specific performance issues |
| Release and renew DHCP lease / forget and reconnect | Connection stability, routing | Low to Medium: fixes specific software-layer issues |
| Flush DNS cache | Domain resolution speed | Low: fixes corrupted cache issues only |
The Biggest Wi-Fi Speed Fix on Windows: Add 4G/5G Cellular with Speedify
All of the fixes above improve the performance of a single Wi-Fi connection. None of them eliminate the fundamental limitation: a Windows PC running on Wi-Fi alone is fully dependent on that one connection. When Wi-Fi slows down during peak hours, when the router drops briefly, or when the PC moves to the edge of Wi-Fi range, every application on the PC is affected with no alternative.
Speedify solves this by combining Wi-Fi and 4G/5G cellular on a Windows PC. Both connections carry traffic at the same time, so the PC gets the combined download and upload speeds of both, and automatic failover between them if either slows down or drops.
Speedify Combines Wi-Fi and 4G/5G Cellular Download and Upload Speeds: A Windows PC running Speedify with a 100 Mbps Wi-Fi connection and a 60 Mbps 4G/5G cellular hotspot active at the same time gets close to 160 Mbps of combined throughput, for faster downloads, faster uploads, and faster response times for every application on the PC. Wi-Fi and 4G/5G cellular are used together, not switched between.
Speedify Provides Automatic Failover When Wi-Fi Slows Down or Drops: When the Wi-Fi connection on a Windows PC slows during peak hours or drops during a router restart, Speedify’s automatic failover technology shifts all traffic to the 4G/5G cellular connection instantly, without dropping a Zoom call, interrupting a file upload, or pausing a download. No manual switching required.
Speedify Distributes Traffic Across Wi-Fi and 4G/5G Cellular in Real Time: Speedify continuously monitors the speed and latency of both the Wi-Fi and 4G/5G cellular connections and distributes traffic accordingly using Speedify’s proprietary protocol. When Wi-Fi is fast, Speedify uses more of it. When 4G/5G cellular is faster, Speedify shifts traffic there. The PC always uses the best available path for every packet.
Speedify Encrypts All Wi-Fi Traffic: Speedify also encrypts all traffic on both the Wi-Fi and 4G/5G cellular connections, like a VPN. Public Wi-Fi networks at airports, hotels, cafés, and co-working spaces are often unencrypted, and Speedify protects passwords, banking sessions, and sensitive data on every network the PC connects to.
How to Set Up Speedify to Make Wi-Fi on a Windows PC Faster
- Connect the PC to Wi-Fi as normal.
- Add a 4G/5G cellular connection: turn on USB tethering on an Android phone, or Personal Hotspot on an iPhone, and connect the phone to the PC with a USB cable (an iPhone needs Apple’s drivers, which come with iTunes or Apple Devices). USB tethering creates a separate network interface alongside Wi-Fi that Speedify can combine with it. You can also use a USB cellular modem or a PC with a built-in 4G/5G modem.
- Download and install Speedify on the PC (available for Windows, macOS, iOS, Android, Linux, and OpenWrt).
- Open Speedify and connect. Speedify automatically detects the Wi-Fi connection and the 4G/5G cellular connection and begins combining them. Both connections appear in the Speedify dashboard with real-time download speed, upload speed, and latency for each. A tethered phone starts at the Secondary priority; set it to Primary in Speedify to use both connections all the time.
- Optionally, set per-connection data limits in Speedify to manage cellular data usage. Streaming mode, which optimizes packet delivery for video calls and live streaming, is on by default.
Speedify vs. Windows Wi-Fi Fixes: What Each Approach Achieves
| Approach | Faster Downloads and Uploads? | Works When Wi-Fi Slows Down? | Automatic Failover? | Encrypted Traffic? | Requires Hardware Changes? |
|---|---|---|---|---|---|
| Speedify (Wi-Fi + 4G/5G Cellular Combined) | ✅ Yes: combined throughput | ✅ Yes: shifts to 4G/5G cellular | ✅ Yes | ✅ Yes | ✅ No: software only |
| Switch to 5 GHz / 6 GHz band | ✅ Yes: within Wi-Fi range | ❌ No | ❌ No | ❌ No | ❌ No |
| Switch to Cloudflare DNS | ⚠️ Partial: page loads only | ❌ No | ❌ No | ❌ No | ❌ No |
| Change Wi-Fi channel | ✅ Yes: in congested environments | ❌ No | ❌ No | ❌ No | ❌ No |
| Move router / reposition PC | ✅ Yes: improves signal strength | ❌ No | ❌ No | ❌ No | ✅ Yes: physical move required |
| Other VPNs | ❌ No (often slower) | ❌ No | ❌ No | ✅ Yes | ❌ No |
Frequently Asked Questions About Making Wi-Fi on a Windows PC Faster
Why is Wi-Fi slow on a Windows PC but fast on other devices?
If Wi-Fi is slow on a Windows PC but fast on other devices connected to the same network, the issue is likely specific to the PC’s Wi-Fi adapter driver, a stale DHCP lease, or Windows connecting to the 2.4 GHz band instead of 5 GHz. Try updating the Wi-Fi adapter driver, releasing and renewing the IP address, and confirming the PC is connected to the 5 GHz band.
Does Speedify make Wi-Fi faster on a Windows PC without a second connection?
Speedify needs at least two active connections to combine. With only Wi-Fi active, Speedify still encrypts traffic like a VPN, but faster speeds require a second internet connection such as a 4G/5G cellular hotspot.
Does using Speedify drain phone battery when tethering?
When a phone is connected to a Windows PC via USB tethering, the PC charges the phone while using the cellular connection. Battery drain is not an issue with USB tethering. Bluetooth tethering uses minimal power on both devices but delivers lower speeds than USB tethering.
Can Speedify combine Wi-Fi with Starlink or a second Wi-Fi network on a Windows PC?
Yes. Speedify combines any mix of available connections on a Windows PC: Wi-Fi and 4G/5G cellular, Wi-Fi and Starlink, Wi-Fi and wired Ethernet through a USB to Ethernet adapter, two Wi-Fi networks with a USB Wi-Fi adapter, or any other combination. Speedify combines them the same way whatever the connection type.
Does Speedify work on all Windows versions?
Speedify runs on Windows 10 and Windows 11.
The Windows settings fixes in this guide improve Wi-Fi performance on a PC within the limits of a single connection. Speedify goes past that limit by combining Wi-Fi and 4G/5G cellular at the same time, for faster downloads, faster uploads, and a connection that keeps working when Wi-Fi slows down or drops.
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