What “performance optimization” actually means
It’s not just running bin/magento setup:static-content:deploy with more locales. Real Magento performance work means understanding where time is spent across the full stack and fixing the biggest issues first.
The most common wins I find: FPC miss rate above 30% due to misconfigured Varnish, Redis being evicted under load due to a wrong maxmemory policy, and blocking JavaScript that delays Time to Interactive on product and category pages.