improve performance for default power schedule

docs/Changelog.md

@@ -16,6 +16,7 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
        that ensure exactly one main node is present and warn otherwise
      - If no main node is present at a sync one secondary node automatically
        becomes a temporary main node until a real main nodes shows up
+     - Fixed a mayor performance issue we inherited from AFLfast
      - switched murmur2 hashing and random() for xxh3 and xoshiro256**,
        resulting in an up to 5.5% speed increase
      - Resizing the window does not crash afl-fuzz anymore