The Speedify Protocol: What Is Is, How It Works

Speedify Protocol - More Lanes for Improved Reliability

In a continuous effort to provide fast, reliable and secure Internet to everyone, here at Speedify we’re constantly improving our bonding VPN service. In this day and age when remote work, distance learning and live streaming are more important than ever, Speedify has launched the new optimized Speedify protocol. 

Briefly put, it is a brand new optimized protocol our engineers have been working on, to make the secure channel bonding / link aggregation we established years ago better. In the past, Speedify made one connection to the server on each of your internet connections. Now Speedify makes up to 8 connections to the server on each of your internet connections! And the difference can be huge: up to twice the performance versus the old Speedify when using it on Internet connections with very high speeds, high latency or high packet loss. You get better overall latency and bandwidth of the bonded connection. 

How the New Speedify Protocol Works

First of all - TCP (Transmission Control Protocol) is one of the transport protocols used in network and Internet communications. It basically divides the information being sent and received into chunks, adds a TCP header and creates a TCP segment. Then, that TCP segment is being sent over the network, following a path of “hops” until it reaches the destination - read more on how the Internet works in this article

Warning: technical details ahead!

The way Speedify used to work is it opened one TCP socket over each Internet connection it used - e.g. one TCP socket over Wi-Fi / cellular / wired Ethernet / etc. With the new protocol, Speedify opens up multiple sockets over each connection (for example 8) - 8 over Wi-Fi / cellular / wired Ethernet / etc.

If there’s packet loss on one of the TCP sockets, only the network packets being sent over that socket are delayed, as the TCP protocol will keep trying to send those, while the other sockets can continue sending other packets. This will minimize the negative effects of high latency and packet loss on connection performance, including the cases when you use Speedify with a single Internet connection.

In plain words

If each connection that Speedify uses were to be represented by a one lane road (e.g. Wi-Fi, cellular, Ethernet, etc.) which cars (network packets) use to get to the destination, the new Speedify protocol adds extra lanes, so that cars are distributed over all the lanes available.

When there’s a traffic event on one of the lanes, the cars on the other lanes will keep going without being dependent on the lane that’s stuck. If that lane remains stuck, the cars that have already been sent on it will be rerouted through the other lanes.

Performance Improvements for Speedify’s New Protocol

According to the tests we did in the Speedify Testing Lab, the new protocol delivers most improvements for:

  • Fast connections, when a single TCP connection is not able to fully utilize those
  • Connections with packet loss - especially the wireless ones
  • Connections with high latency - e.g. satellite (including Starlink)
  • When connecting to servers located far away - e.g. remote workers using connections to other countries.

Here’s a graphic on how high speed is maintained when using the new Speedify protocol vs. not using Speedify:

In the case of connecting to distant locations, we connected from Philadelphia to a server located in Singapore. While a single TCP socket connection got us around 100 Mbps in download bandwidth, when using multiple TCP sockets, we got 200-300 Mbps.

The New Speedify Protocol using Multiple TCP  - Is That Some Sort of Multipath TCP (MPTCP)?

Great question. And the answer is no. The new Speedify protocol works within one single connection, whereas Multipath TCP (MPTCP) works over several connections, similar to the connection aggregation / bonding that Speedify does. MPTCP is more analogous to Speedify as a whole. But here’s more below on MPTCP.

As its name suggests, Multipath TCP refers to sending the data from source to destination through multiple routes (paths). This can be done when you have multiple Internet connections available to apply MPTCP. While running, it’s creating a TCP subflow for each connection it’s putting together and sending data through different paths. 

Difference between TCP and Multipath TCP

Data is flowing through multiple flows from origin to destination. The TCP header of each segment contains, along with the source and destination IP addresses, a data sequence number, so the receiver will get the data from the multiple subflows in the original order, without any corruption. The protocol also has mechanisms to handle congestion control - what it does when one of the connections becomes slow or unreliable.

Find out more about how MPTCP works in the video below:

Speedify - How It Works and How It’s Different from MPTCP

As opposed to the limited “backup flow” ability of MPTCP, Speedify has a more complex approach to the whole thing, with advanced logic and multiple types of connection priorities. Meaning that it will use the connections being bonded according to the performance and priorities set by the user. Speedify will send as much data as it can on:

  • non-metered connections, such as wired Ethernet and Wi-Fi, before sending a lot of data through cellular
  • lower latency connections, such as wired (cable, DSL), before wireless (cellular, satellite)
  • higher bandwidth connections before slower ones.

Imagine Speedify as an on-call optimization specialist, monitoring the quality of each connection at any time and deciding how much data to send over each one so the overall Internet connectivity is at its best. Plus - it’s all encrypted, so nobody can sniff your Internet traffic.

Here’s a comparison table between MPTCP and Speedify:


Multipath TCP (MPTCP)


Allows the use of all available connections



Failover protection



Error correction and packet loss



Software-only solution implementation

Linux, MacOS 10.10+

Linux, MacOS, Windows, iOS, Android

Communication security (encryption)

When running secure protocols over MPTCP (i.e. HTTPS)


Able to dynamically use other protocols (i.e. UDP)



Connection priority



Cost aware



Maximizes bandwidth

yes, limited to the implementation logic


Solution cost

depends on type of implementation (dedicated hardware / software-only) and support needed to set up and maintain

as low as $3 / month

As you can see, there’s a lot that Speedify has to offer when compared to the existing MPTCP implementations. Make sure to give Speedify a try!

Use all of your connections at the same time

Multiple connections, maximum performance

Speedify is the only app that combines all of your connections to keep you online and secure when it matters most.

In the majority of cases, Speedify will automatically detect and start using any Internet connections available to your device while intelligently distributing your online traffic between them for optimal performance. If you need help we have quick start guides available for most common set ups.

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How Speedify Helps You Get Faster, More Reliable Internet

Everything that uses slow, unreliable and wireless Internet connections are the prime beneficiaries of Speedify - from RV travelers and commuters to remote workers and live streamers. Why? Because it caters to their problems and offers an elegant solution. 

Inherently wireless connections such as Wi-Fi, mobile data and satellite are prone to coverage issues and high latency. When you are far from the hotspot or cellular tower, the connection is slow and has added lag. Plus, when your device does the handover from Wi-Fi to cellular or between Wi-Fi networks, an Internet drop is expected, while the new connection is established. This affects especially bandwidth-intensive applications, such as live streaming (including video calls) and gaming. 

By using all your available connections at once, you are safe from such issues. The apps you’re running won’t even see that something’s up, because Speedify will automatically adjust the data rate it’s sending through each connection.

If you’re not yet familiar with Speedify, learn more by visiting our website. To get started, get Speedify now!

Download Speedify

Speedify is the only app that combines your wifi, cellular, wired, and even your friend’s phone signals – and turns them into one ultra-fast and super secure link that keeps you all connected for the best possible live streaming, video calling, or just posting to your favorite app.


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