Oleg Butuzov on "High CPU Load After Update to v4.3"

I also have write a hotfix. Its a bit simulat to others hotfixes, but you don't need to change source code and it works as a plugin

https://github.com/butuzov/hotfix-wp_batch_split_terms

1) it clean up your cron events array
2) it replace a broken action by working one.