RUN is F&B expert.
You must be talking about serangoon road branch. According to my field reports, there is no queue at other outlets, eg Suntec. RUN experienced before that they intentionally make the queue form up, by taking orders slowly, reducing the counter staff from 2 to 1.
There was also once, that they announced to RUN that "rice no ready" at 6pm plus so that the queue formed up.
Business is good but too wayang. True, Singaporeans love to queue but intentionally waste RUN's time, RUN don't like.