Rewriting Level

PageSpeed offers three base levels of optimization: PassThrough, CoreFilters and OptimizeForBandwidth. The CoreFilters set contains filters that Google's PageSpeed team believes are safe for most web sites. The OptimizeForBandwidth setting provides a stronger guarantee of safety and is suitable as a default setting for use with sites that are not aware of PageSpeed. The default level is CoreFilters, to disable use the PassThrough setting.

• CoreFilters
• OptimizeForBandwidth
• PassThrough

Enabling, Disabling And Forbidding Specific Filters

On top of a base optimization level filters can be enabled, disabled or forbidden.