Short answer: on low-end or older Android phones, 2D and side-view robot builders usually run better than 3D mech shooters. Boss Lab: Robot Battle Builder (side view, built with Phaser), CATS: Crash Arena Turbo Stars and Super Mechs are lighter-feeling picks than 3D real-time titles like War Robots or Mech Arena. Check each game's install size and minimum Android version on Google Play for your device.

What actually stresses a budget phone

3D rendering and live multiplayer at the same time.

Large downloads and extra asset packs.

Long sessions that heat the device.

Build-then-fight games avoid much of this: combat is short, often 2D, and doesn't require split-second input, so frame dips don't ruin a match.

Comparison

Game View Customization depth Reflex-dependent?

Boss Lab 2D side view 60+ parts + 3 AI brains No (auto-battle)

CATS 2D side view Vehicle bodies, weapons, gadgets No

Super Mechs 2D Mech parts, turn-based No

War Robots / Mech Arena 3D Robots, weapons, loadouts Yes

Getting the most out…