Issue description:

Performance is impacted significantly during rain

What happens:

This line here - and similar lines in the other block classes - causes particle collision to grind to a near halt.

What you expected to happen:

I expect performance during rain to be identical to performance during clear weather.

Steps to reproduce:

1. Create a storage network with various cables and constructors, exporters, etc.
2. Toggle rain on.
3. Hang around among the cables and devices.
4. Observe performance drop.

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.15.2
• Forge: 13.2.30
• Refined Storage: 1.8.6

Does this issue occur on a server? Yes

How did you come to this conclusion? Just tried and can't seem to reproduce this.

The voxelshape code could use some caching.

Here is a snapshot of the CPU time @Darkere

Fixed now. The shapes are now being cached during startup.