Problem: node startup is slow

[yihuang]

Solution:

• try iavl lazy mode

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PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
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• Have you included tests for any non-trivial functionality?
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• Have you checked your code formatting is correct? (go fmt)
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• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
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Thank you for your code, it's appreciated! :)

The base branch was changed.