Conclusion: Version 2.0.15 runs smoothly on any device with at least a Snapdragon 660 or equivalent. Budget phones (MediaTek Helio P35) should stick to software rendering.
Whether you used a Razer Kishi, MOGA, or a generic USB OTG gamepad, 2.0.15 offered low-latency input. Bluetooth latency was also improved over versions prior to 2.0.10. epsxe android 2.0.15
Some titles require special toggles:
Fix: Go to Preferences → System → Check “Use frame skipping” and set to “Auto.” Also disable “Overclock PlayStation CPU” unless needed. Conclusion: Version 2