Technicolor TG582n FTTC Ethernet Ports

[#1]

I'm due to get fibre installed this week and was just having a look at the supplied router and I noticed that it has 100mbps ethernet ports. Has anyone had any problems getting their full line speed using the ethernet ports on the router? Particularly if your line supports nearly 80mbps?

[#2]

Don't forget it's a 100mbps link up to the modem, so if more than one of your ports is sharing the link you're already working at half that