Just downloaded the first 1.14.1 pre-release, and i was hoping to really see the slow chunk rendering gone, but sadly, i saw the same thing, chunks not loading properly and MASSIVE fps loss. I'll upload a video on youtube showing the issue and some screenshots here.
Youtube Video: https://youtu.be/V3ZpMr4rOP0
Environment
== PC SPECS ==
IntelHDGraphics 5500
Intel i3 5500u
4GB Ram
Windows 10 Home
Most recent version of Java 8
== MC CONFIG ==
Render Distance : 8
Graphics : Fancy
Smooth Lightning : Maximum
VSync : No
Mipmap Levels : 4
Biome Transition : 5x5
Resolution : Actual (1366x766@60)
Clouds : Fancy
Particles : All
Entity Shadows : Yes
Duplicate of MC-151084