- > Using file encryption via EFS may lead to slower I/O performance because encryption causes asynchronous I/O to become synchronous. See [Asynchronous disk I/O appears as synchronous on Windows](/troubleshoot/windows/win32/asynchronous-disk-io-synchronous#ntfs-encryption). Instead, you can sonsider using SQL Server encryption technologies like [Transparent Data Encryption (TDE)](/sql/relational-databases/security/encryption/transparent-data-encryption), [Always Encrypted](/sql/relational-databases/security/encryption/always-encrypted-database-engine), and column-level encryption [T-SQL functions](/sql/t-sql/functions/cryptographic-functions-transact-sql).
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