@huynhmik . I saw your post on timings. Out of interest, are you using Linux?
I'm on FTTC NBN25 using ethernet computer. My response time to router (VR1600) is 1 ms and to TPG is about 6 ms. Your times are a bit slow.
Your speed test of 12 down and 1 up looks like the speed of NBN12. My speeds are over 20 down and over 4 up.
