Hi, Mei, actually congestion is expected...this is year 2016 currently, the congestion might not so obvious, but if you look at 3 years, 5 years, 8 years timeframe, more and more people will come in, and thus congestion is unavoidable.
As new developments are getting more and more nowadays, population will also increase. So jam can't be avoid. I am now staying in Kota Kemuning, as due to higher population compare to the good old days, it is now starting to get more congested. Even a 3 minutes route will need to jam for around 10-15 minutes.