sync hashBlocks performance issue

[dapplion]

Describe the bug

Sync module tracks the blocks downloaded to do peer scoring latter. However a CPU profile reveals it's a very expensive operation. How can the sync module track the blocks in a succinct unique manner without having to hash all the blocks upfront?

Expected behavior

Track blocks in a cheap manner

Steps to Reproduce

Screenshots

Desktop (please complete the following information):

• OS:
• Version:
• Branch:
• Commit hash:

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 15 days if no further activity occurs. Thank you for your contributions.

[dapplion]

ssz v2 should cache the blocks root so not extra processing is done in the blocks