Set below arguments to "false" in the prj_projects_read.xml to limit the amount of data that's coming back.
<args name="include_dependencies" value="false"/>
<args name="include_subprojects" value="false"/>
<args name="include_resources" value="false"/>
<args name="include_baselines" value="false"/>
<args name="include_allocations" value="false"/>
<args name="include_estimates" value="false"/>
<args name="include_actuals" value="false"/>
<args name="include_custom" value="false"/>
<args name="include_burdening" value="false"/>