How much does a VPN impact local network bandwidth? Some claim that VPNs also slow down local traffic, especially when dealing with high latency or low speeds. What’s your take on this? How do you balance VPN usage with local network performance? What factors should be considered, such as server selection, protocol choice, or the role of local hardware?
How important is VPN performance on a local network?
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I personally observed the impact of VPNs on local network performance and have firsthand experience to share. Last year, when we transitioned our office network to a cloud-based VPN solution, some users experienced up to 30% speed losses in their internet connection. Especially when we set the server location to Europe, we faced latency issues because our local traffic was being routed through the VPN tunnel. After analyzing the situation, I realized that the VPN had to encrypt the local traffic as well, and the performance limitations at the gateway were the main culprits.
Later, by switching from OpenVPN to the WireGuard protocol and moving the server location to local servers within our country, we significantly reduced this problem. Thanks to WireGuard's kernel-level operation and lower CPU usage, the load on the local network was almost eliminated. Additionally, we reviewed the hardware capacity of the router and VPN client in the local network; upgrading to devices that support gigabit connections further minimized performance loss. Ultimately, I saw that not only the server location and protocol, but also the local hardware plays a critical role in maintaining this balance.