Hotfix/txn update frequency

[daechoi]

Description

Fixes # Increased the number of transactions to update at once from 5 to 500

Checklist

• [ ] Targeted PR against correct branch.
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [ ] Run meteor npm run lint
• [ ] Added an entry to the CHANGELOG.md file.
• [ ] Re-reviewed Files changed in the Github PR explorer.