How to speed up Rclone?

Here are several ways to optimize Rclone's performance:

1. Use --transfers flag

rclone copy --transfers 32 source:path dest:path

This increases the number of concurrent file transfers (default is 4). Try values between 16-32 for better performance.

2. Enable multi-thread downloads/uploads

rclone copy --multi-thread-streams 4 source:path dest:path

This splits large files into chunks for parallel transfer.

3. Adjust buffer size

rclone copy --buffer-size 256M source:path dest:path

Increasing buffer size can improve transfer speeds, especially for larger files.

4. Use --fast-list

rclone copy --fast-list source:path dest:path

This makes directory listings faster but uses more memory.

5. Modify chunk size

rclone copy --s3-chunk-size 128M source:path dest:path

For cloud storage like S3, increasing chunk size can improve performance.

6. Combine multiple optimizations

rclone copy \
  --transfers 32 \
  --multi-thread-streams 4 \
  --buffer-size 256M \
  --fast-list \
  source:path dest:path

7. Additional tips:

• Use --progress to monitor transfer speeds
• Consider using --checkers 16 to increase concurrent checking processes
• If copying many small files, try --check-first to check all files first
• For local to local copies, consider using --copy-links instead of following symlinks

Remember that optimal settings depend on:

• Your available bandwidth
• System resources (CPU, RAM)
• Storage type (local, cloud, etc.)
• File sizes and quantities

Start with moderate values and adjust based on your specific use case and performance results.