SMRT is pretty bad in many things unlike SBS Transit.
I won't place it bad to a certain extend, the WLDEP (SE/YI) side
things are still OK, AMDEP (North,east,Central) are pretty much
decent, But it can't be blamed if the traffic is tight, eg SV 67
that passes through TK, and Upp/Bukit timah road, Where traffic
gets tight in a certain timing. The WL (WLDS) side I won't be
surprised to see super long frequencies, Everyday I can see 637X
coming in at 0720 and 638T reaching BNL at about 0740, By the time
I left for work. You can imagine how long can you wait for a 178
after 637X has left.