fix(slate): performance issues caused by ultra-long nodes(#5992)

[Guan-Erjia]

Description
Calling Node.fragment incurs additional performance overhead due to array destructuring. Consider replacing it with slice and contact to achieve the same functionality.

Issue
Fixes: #5992

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)
• You've added a changeset if changing functionality. (Add one with yarn changeset add.)

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Latest commit: 907c91d

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