The thing is , this lag problem never existed to the extent it does now, and what relatively few lag related problems we had before certainly didn't effect so many different aspects of the game and to so many people as it does now.
The whole wipeout community has not gone and changed their internet connections ,SL says that they have not changed anything that should/would effect the game.
So what's causing the lag ?
Don't tell me,let me guess,.....Spectator Mode.
You can't blame the 2.70 PS3 update because the game was working online with that,and without these problems.