Lion's Arch map loading time increased a lot.
As soon as the August 28, 2017 update went live, the loading time for Lion’s Arch increased from 8 seconds to over a minute.
You might try a -repair of your data file. (Instructions available in the technical forum/knowledge base and on the wiki.) That typically reduces load times for a lot of people.
There are also a number of new assets in LA, so it could just be the first visiting LA that takes longer.
John Smith: “you should kill monsters, because killing monsters is awesome.”