# Slow VPN speed over Ethernet, fast over Wi-Fi (Debian + Fortinet)
**URL:** https://forum.pritunl.com/t/slow-vpn-speed-over-ethernet-fast-over-wi-fi-debian-fortinet/3291
**Category:** Pritunl VPN
**Tags:** pritunl
**Created:** [April 30, 2025, 12:53pm UTC](https://forum.pritunl.com/t/slow-vpn-speed-over-ethernet-fast-over-wi-fi-debian-fortinet/3291 "2025-04-30T12:53:54Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@hasantokaloglu](https://forum.pritunl.com/u/hasantokaloglu)
#### Post date: [April 30, 2025, 12:53pm UTC](https://forum.pritunl.com/t/slow-vpn-speed-over-ethernet-fast-over-wi-fi-debian-fortinet/3291/1 "2025-04-30T12:53:54Z")
Hello,
We have a Pritunl server running on Debian. Inside the office, all traffic goes through a Fortinet firewall. When connecting over Wi-Fi, we get 80–100 Mbps through the VPN, but over a wired connection the speed doesn’t exceed 10 Mbps. We haven’t made any special configuration on the Fortinet firewall. What could be causing this issue?
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### Author:  [@zach](https://forum.pritunl.com/u/zach)
#### Post date: [May 1, 2025, 6:13pm UTC](https://forum.pritunl.com/t/slow-vpn-speed-over-ethernet-fast-over-wi-fi-debian-fortinet/3291/3 "2025-05-01T18:13:58Z")
Typically CPU core speed will have the largest effect on the connection speed. You can try the ChaCha20-Poly1305 cipher option in the server settings which may provide better performance.