Everyone is having this problem with extreme lag since patch 1.4.
Completely, 100%, false.
I am not experiencing any significant amount of network lag nor were any of the dozens of people I played with yesterday while I was going through pug flashpoints (I've been asking about this stuff because folks on the forum are under the impression everyone is having issues). A few people on the forums complaining does not equal everyone. Vast numbers? There are a few dozen people talking about each issue on the forums (of which there are like 3 or 4 people that appear to make most of the posts... repeating the same stuff over and over...)... I was just on Dromund Kaas with 190 players that were apparently not experiencing any game breaking issues at all I (on just my server, of course). I have 4 computers with SWTOR installed (one 30 miles from the others) and none of them are experiencing issues post 1.4.
The fact that people don't usually come to the forums to say "hey, everything working great over here" doesn't mean everyone is experiencing technical issues...