Low Framerates -MC 1.9.4

I am playing with Idle (pause screen Frame rates) of 57 fps, and playing it drops down to 30-32 fps

in Minecraft I am playing with the following settings:

I am including all settings as for more accurate documentation, many settings do not effect the fps

Graphics: Fancy
Smooth Lighting: Maximum
3D anaglyph: off
GUI Scale: Normal
Brightness: Bright
Particles: All
Use VSync: off
Use VBO's: on
Render Distance: 32 chunks
Max Framerate: 60fps
Attack Indicator: Crosshair
Clouds: Fancy
Fullscreen: off
Mipmap Levels: 4
Entity Shadows: on

Resource Pack: [1.9] Veristicraft (128x HD Realistic)

System Specs:

Windows 10 Home
AMD FX-6300 3.5GHz 6-Core Processor
G.Skill NS Series 8GB (2 x 4GB) DDR3-1600 Memory
MSI Radeon R7 370 4GB Video Card

Java Arguments at launch

-Xmx5G

For the Following I removed the FPS limit

Pause Menu:

32 Chunks (Current Max): 48-52 fps
25 Chunks: 58-61 fps
20 Chunks: 64-76 fps
16 chunks (Pre 1.9 max): 98-111 fps

Playing:

32 Chunks: 34-54 fps
30 Chunks: 37-58 fps
25 Chunks: 46-50 fps
20 Chunks: 38- 50 fps
16 Chunks: 76-102 fps

In case the bug/error is biome / terrain feature specific:

map seed: 3568454092811859635
at coordinats of : (x/y/z) 1456/ 62/62
Facing east (towards positive X0 (-130.7 /15)

This is all run with 5gb of ram, and neither the processor nor graphics card are going over 50 percent usage, with less than 30 percent of the allocated ram being used