OpenVPN SSL/TLS is a secure protocol but that security you enjoy so much can tax the routers memory and CPU. When you install Tomato, do so on a router that can handle the workload. A router with 64MB of memory should handle a couple of VPN clients connected simultaneously. Any more than that, and you may need a router with more memory.
Tomato VPN is awesome for so many reasons. For one, you can use it as a VPN proxy. This way, when you are connected to those WiFI hotspots at your local coffee shop, you can re-route your Internet activity through your Tomato VPN server at your home office. What’s so cool about that? Well, whatever goes through the tunnel is encrypted.