If someone were to use a couple of the top VPN services on the same device at the same time, how would that work?
Would the second VPN pick up the connection after the first one, and everything would work smoothly?
Doing it right now with three vpns, takes so long to load
If it works, would it slow down speeds?
I don’t know about running 2 different brands, but some VPN has the option build in to run a double VPN.
Assuming you mean you want traffic to go through VPN-A and then VPN-B and that you aren’t trying to do some sort of load-sharing, this isn’t likely to work in a turnkey fashion. You will need to set up the routing/iptables (assuming linux) to get the traffic to flow from one into the other. Doable, certainly, but not going to just work out of the box and prone to all kinds of issues. Also, your MTU is going to suck, badly, not to mention the latency/jitter you will have from tunneling via 2 VPNs.
I end up doing this for work. I have a vpn on my gaming router- still very high speed. But for work (government job) we connect to a state-run vpn. I then get about 10% of my speed 
How do I know which ones allow it?
By that logic, is Apple’s Private Relay more secure than some of the top VPN services on their own?
I know this is a year-old post, but I found this thread and figured I’d clarify for people who read this and think you can’t do dual VPNs–you can, and it isn’t even slow if you do it right!
For me, it actually is faster which is a bit counterintuitive until you look at how the web traffic is routed. As long as one of the services is designated a “personal VPN” and the other is a “device VPN”, they can be stacked even if they’re the same type.
I only used a few brands due to having more than enough VPNs to test with so I’m sure people’s results may vary, but wanted to clarify those things since I couldn’t find much online about it, so here’s some info and details on setup in case others run into being throttled, etc.
Have you tried this on a pc? I’m thinking of stacking 2 different providers some day, but I’m worried that their respective killswitches will step on each other
I have only gotten it working when one is a custom DNS rerouting VPN and the other is an IKEv2 VPN, and it was kinda iffy. I’ll try a few different things and report back if I find anything that works well
Are you on Linux? Check this out:
If you’re on Windows, look for an application-level firewall program. I’ve already used the above program to do some minor networking stuff and it works. I bet you could take the second VPN and make rule for it only to communicate through the first, but there might be some other stuff you have to configure like ports and systemd on Linux