There are no hard set rules as to which protocol will give you the best speed. OpenVPN over UDP is a good default to try. If you find yourself having issues, try switching to a different protocol to see if your VPN speed improves.
Ultimately, not all VPN providers are created equal. Even under ideal conditions, the speed and reliability they offer may be drastically different. If you have tried implementing several of the methods mentioned in this article but are still not seeing speed improvements, it may be time to consider switching VPN providers.
1) The VPN Server Location. Typically, establishing a connection with a VPN server closer to your location will result in better speed. This is because the complexity of Internet traffic goes up as the distance between you and the VPN server increases. The more complex the traffic, and the greater the distance data has to travel, the slower the VPN speed.
5) Your Network Setup, Whether your device is on a wired network and physically connected to a router or using WiFi can affect VPN speed. This distinction is especially relevant if you have a fast connection to the outside world. Because a wired connection is often quicker than WiFi, the latter can be a limiting factor. You can try plugging your computer directly into the router to see if there is a speed improvement.
3) Encryption Level, Stronger encryption is often more complex and can, as a result, slow down a VPN. A 128-bit encryption will in most cases lead to a faster connection than a 256-bit one. On the downside, lowering encryption strength will make the VPN connection less secure and the transmitted data more vulnerable. So, you can try playing around with the encryption level, but unless you see significant speed improvements with weaker encryption, it is best to stick to the stronger versions.
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