That's not exactly lightspeed, unless he was doing a truly ridiculous amount of things.
Put another way, in 1/1000 of a second, light travels 300 Km. Does Northstar do 'runs about 300 Km worth of stuff' in that time? If so, lightspeed!
I've seen a variety of different scans people thought made Northstar lightspeed (including the famous one from 'The Vault' which gets misinterpreted:
'Speed of Light: 186 000 miles per second. Speed of the servos in Cyclops' visor: Considerably slower. Northstar steps into the gap -', emphasis mine, nowhere does it say he's going lightspeed). None of them have actually measured up to lightspeed, yet (though I'm open to new ones!). Marvel likes to talk about Northstar potentially being capable of approaching lightspeed; there's a lot of 'could be/maybe' on that presentation.
If he can't actually approach lightspeed (like, really close) by feats, I'm not sure how he's stacking up to Speedy, here, who has feats for 'Hmm, look at those radio waves approaching me, I think I'll just leave now' as I recall. And if he's not in Speedy's league, he's getting taken out first by Speedy, who then goes on to beat everyone else who actually matters unconscious.
Really, I'm hoping for more feats because that gives me something interesting to look at. ^_^