Reduce collection resizing costs

[benaadams]

Changes

• Clear ConcurrentDictionary backing directly rather than using .Clear which resizes it to 31 elements meaning are many resizing costs to bring back up to size when repopulating
• Clear evm collections rather than resizing down to avoid paying the resizing back up costs
• When pruning use the array if created, rather than reenumerating the dictionary
• Clear precomplie cache (bugfix)

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• Optimization

Testing

Requires testing

• No

[LukaszRozmej]

Can you also explain/show any real gains from this?