Is there a go-to configuration/parameters for the best optimized experience on Android?

[MQahawish]

Hello , I'm building an Android app with llama.cpp and looking to get the best possible performance. For those who've done this before - what optimizations worked well for you?
I'm interested in all aspects - sampling settings, memory management, GPU usage (especially with mobile GPUs that use shared memory), or really any other tweaks that helped improve the experience.
Are the default settings good enough, or did you find specific configurations that made a noticeable difference?
Would appreciate any tips or lessons learned from running llama.cpp on Android devices!