lower opcache consumption and wasted memory after update

Hello developer,
After the update in Sept.08 , the initial opcache memory consumption (before site warm-up) has greatly decreased (decreased 15% or so); the wasted memory (about 15%) began to appear after I completed “warm-up”. I the past versions, the init opcache memory consumption is always fixed (15% more than today’s) before site warm-up, and there’s always 0 MB wasted memory.
I am sure that I do restart php-fpm service before these steps.