I still use Hurricane Electric tunnels fir my v6 and ping times/throughout are so close as to be in the noise for most everything. It probably helps that I'm using a tunnel endpoint literally 10 miles from my house however.
My IPv4 ping times to Google and Facebook are 2.6 milliseconds. I suspect any HE tunnel is going to be worse than that (in a statistically significant sense). I don't know that latency would necessarily be perceptible the majority of the time, but I strongly suspect outliers would be worse and more frequent.
Also, I doubt HE's ipv6 tunnel is going to carry anything close to 1Gbps for me for free ;-).
Also, I doubt HE's ipv6 tunnel is going to carry anything close to 1Gbps for me for free ;-).