Support for EL without reflection for better JSF performance.
The idea is to add a new tag to declare types of the variables used on a page and use this type information
to compile EL expressions into byte-code during initialization (deployment)
If the page contains at the beginning
<s:typedef var="myBean" class="com.company.package.Bean" />
then all EL expressions can be compiled into bytecode at initialization time (and no reflection will be used for myBean access.
Some examples of implementation of compiled EL can be found here
This should help much with JSF performance issues