Cat 5 is 100m, Cat 5e is NOT rated at 1000m but supports it.
As far as speed it depends on; Your incoming bandwidth, what your using your internal network for. If your 5e you are Gigabit and should be good, if you had more than 1 Gigabit coming in then you would have a reason to upgrade internally.
Sure you could upgrade critical runs like to your router, to the Node 2i to say, Cat 6. Would you notice a difference from 5e to 6? Probably not, now if your talking about upgrading the quality of the cable that is another debate and someone else can field that one.
By the way your Node 2i is ethernet and wireless? If you are using it wireless than you need to be looking at your wireless speed.
As far as speed it depends on; Your incoming bandwidth, what your using your internal network for. If your 5e you are Gigabit and should be good, if you had more than 1 Gigabit coming in then you would have a reason to upgrade internally.
Sure you could upgrade critical runs like to your router, to the Node 2i to say, Cat 6. Would you notice a difference from 5e to 6? Probably not, now if your talking about upgrading the quality of the cable that is another debate and someone else can field that one.
By the way your Node 2i is ethernet and wireless? If you are using it wireless than you need to be looking at your wireless speed.