resource pack made MC run out of memory

Put the summary of the bug you're having here

*What I expected to happen was for the world to load with the resource pack on
Describe what you thought should happen here

*What actually happened was it took ages to load then froze, took me back to the launcher and told me there was an error from running out of memory
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. put on sphax resource pack (512bit)
3. load into a world