Why is Apple 6p so slow to receive messages on WeChat?

First, because the iPhone6 is equipped with iOS9 system, the message push mechanism of the system has changed, and WeChat has not been updated in time, which leads to the delay of iPhone6s WeChat messages currently using iOS9.

Second, you can set the WeChat notification of iPhone6s as shown below. If you can't receive WeChat messages on time, you have to wait for the new version of WeChat to be updated.