The Intel APX features are not fully tested, and there are some unresolved bugs.

Currently, APX is not enabled consistently between product and debug builds.

If the hardware supports Intel APX:

1) In product builds, APX is disabled by default, even if the user explicitly enables it using -XX:+UnlockExperimentalVMOptions -XX:+UseAPX.

2) In debug builds, APX is enabled by default regardless of whether the user explicitly enables it or not.

The proposal is to enable APX for both product and debug builds if and only if the user explicitly enables it using -XX:+UnlockExperimentalVMOptions -XX:+UseAPX.