For the record, i've been experiencing the exact same phenomenon. LA has been taking longer to load for the last week or two. Longer than it used to and much longer to load than any other zone i've mapped into.
Same here. I have 250GB SSD with win8 and ONLY GW2 on it. i5 2500k @ 4.4Ghz, GF 570gtx, 16GB Ram, Asus P8P67 Pro. The game definitely takes longer to load than usual. I'm not too bothered as I think it's much worse for people with steam driven HD's