With Optifine, you can boost your FPS in Minecraft Bedrock without significant graphical compromises.
The tool provides three settings in the Resource Pack menu: High Performance, Balanced, and Graphical Fidelity. You can switch between them based on your needs.
I managed to achieve a 40% performance increase using High Performance mode on my mid-budget Samsung phone.
I could tell the difference in visuals; the block textures are slightly different, and explosion effects for TNT and Creepers were removed. Particle effects in general were severely cut—a tough but effective performance-boosting measure. But if you ask me, the trade-off is well worth it!