Arch Linux has recently accepted the RFCs to enable LTO by default and to provide a x86-64-v3 port.
https://www.phoronix.com/scan.php?page=news_item&px=Arch-Linux-LTO-Proposed
https://www.phoronix.com/scan.php?page=news_item&px=Arch-Linux-x86-64-v3-Port-RFC
Is Manjaro going to follow Arch Linux in enabling LTO by default and providing x86-64-v3 builds?