Here in Malaysia, you should know that when using the escalator, if you are on the right lane means you need to walk up the stairs fast and if you are on the left lane means you can just stand until you reach the top. That's the unspoken rule, if you notice how the system works in the city.
If you choose to stand on the right lane while the queue is long, especially in busier places like KL Sentral and Masjid Jamek, you'll stop the crowd. There's always some people who don't know about the unspoken rule that will stop everyone from going up.
Don't be one.