Well, do you not recall the massive amounts of moaning that took place because now everyone's I/O bound stuff (most webservers/databases) works far slower than

Well, do you not recall the massive amounts of moaning that took place because now everyone's I/O bound stuff (most webservers/databases) works far slower than it used to when spectre/meltdown patches had been applied? If we could get rid of the cache flush that occurs when a userspace process syscalls, there'd be a lot less heat produced at your local data center.