Originally Posted by
uanj
Yes, Skytrain is fast but you need to get to it and board so maybe allow more than 60 seconds

. I left the Starlux lounge when I asked where the restroom is and was told they don't have any. So probably no showers, either! Very surprising, hopefully they will in the future. I heard the food was good with things on order, but I did not take a look myself.
OP, T1 security in the morning can get backed up a bit, so not knowing how long you have I would say do not linger anywhere. Once you are airside in T1 you can go anywhere, even walk or take the Skytrain back to T2. Everything is connected airside and makes for a nice long walk if you have the time and inclination.
I haven't used T1 for years, but if the JX lounge is on the 4F along with other lounges, there are public showers next to the PP lounge. Those public showers don't have any amenity. The PP lounge provides a shower basket with towels and amenity for its guests, and I remember people without PP access can purchase them as well. Not sure how if the JX lounge would have those.
Assuming
illico arrives on one of BR's TPAC, the lines shouldn't be too bad. The security lanes usually are the worst between 7-9am in my experience.