Connecting work VPN slows internet for rest of devices on network

VPN
1

I have a new work laptop which I connect to VPN. As soon as I connect to the VPN, the rest of the devices on my network go from 270Mbs download to around 10Mbs download and 24Mbs upload to like 4 or 2mbs.

When I disconnect the VPN, back to normal speeds again.

The work laptop is plugged into ethernet and so is the PC I speed test from.
I’ve also tried putting the work laptop into an isolated guest WiFi network.

This is super weird to me, I get the VPN will slow the internet for the work laptop that is using it but why the hell is it affecting the rest of my devices on the network? Anyone have any ideas?

2

You said all other devices slow down, but you also said you’re testing speeds from your work laptop. This doesn’t really make sense. To find out if other devices are affected you need to run speed tests on those as well.

So work laptop non-VPN speeds at 270/24 Mbps? Then once you connect to the work VPN the speed on the laptop drops to 10/4 Mbps? It’s normal for VPN to reduce speeds, especially if that VPN endpoint is on a low speed connection or otherwise having congestion issues.