About the problem that the delay of the PPPoE client ping gateway is 15ms.
I have done PPPoE with ROS for many times. I remember that there was a problem that the delay of ping was 15ms. After a boring search today, the result from Baidu is basically inconclusive. No one knows why. Some even answered that I had called Huawei and said it was normal.
I just googled it and found the official forum of MT.
Http://forum.mikrotik.com/viewtopic.php?f=6&t=10560
If you are not good at English in this post, you can use translation.
It is said that turning off the compression function of Profile can solve the problem of high ping latency, and then try it immediately, and so it is.
Write it down here for later use.