You manage to link an article that talks about an issue, but then you talk about a completely separate issue that has nothing to do with exactly that. There is also this thread for further reading for you: https://en-forum.guildwars2.com/discussion/109755/wvw-performance-and-map-cap-testing/p1 Skill lag literally comes from the game server not being able to handle all the calculations and packages, the time it takes for your skills to activate and be registered as such. Lowering player count would be an obvious fix to that and they are just testing whether that has the intended effect or not, while also exploring other possibilities.