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The recommended size for files loaded via Snowflake's Snowpipe is generally suggested to be between 1 - 10MB when compressed. This size range is optimal because smaller files can be processed more quickly and efficiently by Snowpipe, which is designed for continuous data loading. Loading smaller files can lead to faster data ingestion and better performance, as it reduces the overhead associated with file management.

When files are within this size range, they can easily be uploaded per the Snowpipe mechanism without causing delays or resource bottlenecks. Additionally, smaller files allow for better parallel processing, which aligns with Snowflake's architecture that thrives on executing multiple tasks at once.

Larger files, while they can be loaded, might introduce complexity when it comes to processing time and resource utilization, as they can take longer to load completely. Therefore, choosing smaller compressed files enhances efficiency and supports Snowflake's real-time data handling capabilities.