Although I cannot confirm, as I havent flown J to DPS only in Y, I do not think a fast track system is in place in DPS from CX. This is because immigration requires passengers to buy visa on arrival I think.

So the advantage you have is by being in J, you are first off the aircraft. Perhaps it would be good to sit downstairs as opposed to upstairs if you are on the 747, so you really can be off the plane first.

China Airlines lands just before CX into DPS in the afternoon, and their flight is often also a 747, and so lines can be very long for immigration, so if no fast track is available, it is very wise to walk quickly to reach the immigration lines.

There is a way you can fast track by paying a fee, you can be greeted by someone at the arrival gate who will escort you through immigration and assist you with your baggage. This will ensure a quick arrival process, but it is expensive. This set up needs to be pre-arranged.