If the server you are on supports GZip compression, you can enable this option to significantly reduce your bandwidth requirements. GZip compression compresses php output server side, prior to sending to the visitor.

• Enable GZip Compression :: This turns GZip compression on or off.
• Compression Level :: This sets the level of compression that is used. The higher the number, more compression and slower output. The range is from 0 to 9.