SlimROM maintainers historically used with -O3 -flto -march=armv8.2a+crypto . Our benchmark on Snapdragon 625 (Cortex-A53) shows:
As of 2025, over 42% of active Android devices run versions 8–10 (Google Dashboards), with OEMs ceasing security patches after 2–3 years. Custom ROMs bridge this gap. Among them, SlimROM (founded 2012) distinguishes itself through minimalism—targeting a sub-400MB system footprint compared to AOSP’s ~800MB+. slimbox rom high quality