FPS Drops Really Fast

Thank you for your report!
However, this issue is Invalid.

Performance drops are expected to happen between versions, especially in betas. Simply stating that "My game is laggier" is not helpful for Mojang to diagnose your issue. If you can pinpoint a specific cause when lag happens for you, please open a new report for that specific issue. If you think this might be a hardware issue please contact Community Support as they might be able to help with your issue.

Keep in mind that Mojang is constantly optimizing the game and simply playing the game provides feedback to Mojang on which parts cause performance issues.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Even though your phone has 6 GB of ram, that won’t help much when there is a lot of grass in the area and your render distance is too high. Take some of the grass out and lower your render distance.