I am a WP admin who is struggling with site performance issues usung the below stack
AWS spot instances with auto scaling and EFS for WP data. Mounted EFS with AWS recommended settings.
Using cachefilesd for file system caching for EFS and Fast Cache plugin.
Keen to hear from other WP admins and devs on how they have implemented HA WP solutions with good performance
Thanks. Happy to provide more details if required.