Minecraft Windows 10 Edition Version 1.1.2 Build 393060

My Minecraft world has become unplayable due to high CPU usage when moving.
This happened after exploring further away from my base...See video for example.

The issue only exists within my current world, new worlds do not display the issue.

Things I have tried:

• Adjusting graphics settings to their lowest values
• Adjusting graphics settings to their mid values
• Exporting the map, deleting it then importing it back in

YouTube video: https://youtu.be/TdonBOPazjQ

Download corrupted world via Google Drive: https://drive.google.com/file/d/0BwrWzrxdVsQ8QUFOR0Raa2pQMVk/view?usp=sharing

Download world before corruption via Google Drive: https://drive.google.com/file/d/0BwrWzrxdVsQ8QzEwZUk5b190eXM/view?usp=sharing

System Specifications:

• CPU: AMD Phenom II 1090T (Overclocked to 3.7Ghz)
• GPU: Gigabyte (AMD) Radeon R9 270 O.C
• GPU Driver Version: 17.6.2
• Motherboard: Gigabyte 990FXA-UD7 Rev 1.1 (Bios Version F10)
• Primary Drive: Samsung SSD 750 EVO 250GB
• RAM: 24GB G.Skill F3-12800CL 10-8GBXL (3x 8GB Modules)