Thanks Rajiv for your consideration, actually I wanna know ,In the Class rule we have check box as Encrypt BLOB? & which situations we are using this option & after encrypting how optimize happen? & what about the performance?
The links shared by Vidyaranjan has the PAL statistics used to capture for additional overhead of encryption and decryption. Please note that the optimized properties are not encrypted unless the property is of type Password or Text Encrypted.