Yeah, give them time, hopefully it will get fixed.
The issue continues with 0.9.0 build 3. It behaves the same with all 3 render distances.
The issue continues with 0.9.0 build 2.
Here is a video of the issue. The apparent framerate drop at the end is my camera though, not the game.
https://www.youtube.com/watch?v=zq4jx-WNqdc
Same issue.
This video demonstrates the issue.
I had been playing for maybe 15 minutes, local PocketMine server.
Free RAM maintained around 28 - 32 MB free at all times, exploring the entire world. Plus screen recorder software. This shows the issue is only when the keyboard is accessed a few times.
Please stop flooding with comments. This IS a bug report. It is all we can do. Just be patient and wait. You can also try contacting them yourself in Google+ or Twitter.