Panel always refreshed except by limitToList

This panel will refreshed in every ajax request:

<a4j:outputPanel ajaxRendered="true">
<h:messages />
</a4j:outputPanel>

If you want to ignore that outputPanel just add limitToList:

<h:form>
<h:inputText value="#{person.name}">
<a4j:support event="onkeyup" reRender="test" limitToList="true"/>
</h:inputText>
<h:outputText value="#{person.name}" id="test"/>
</hform>