Just wanted to share an update — I followed the guide from Start9: Start9 | Blockchain Migration, but instead of copying only the chainstate and blocks folders, I also included the indexes folder.
I copied everything from a fully synced Bitcoin Knots node running on macOS, and it worked perfectly.
The entire process, including the data transfer and setup, took less than a day. After restarting Bitcoin Knots service with the copied data, it resumed syncing immediately and at full speed — no more delays or sluggish block validation.
This method saved me a ton of time and frustration. Highly recommend it if you’re stuck with slow sync speeds.