pocof is too slow when handling a large number of elements.

[krymtkts]

• The first time rendering is slow because it starts at EndProcessing
• The filtering process is slow

[krymtkts]

Prototype implementation for asynchronous rendering. #186

[krymtkts]

https://github.com/krymtkts/pocof/actions/runs/9432907456/job/25983248040
Some Pester test cases have become flaky.