diff --git a/core/oql/expression.class.inc.php b/core/oql/expression.class.inc.php
index 18f51354c..1f65b5c5b 100644
--- a/core/oql/expression.class.inc.php
+++ b/core/oql/expression.class.inc.php
@@ -178,7 +178,7 @@ abstract class Expression {
 	abstract public function CollectUsedParents(&$aTable);
 
 	/**
-	 * @return boolean evaluation of the expression value, false if no conversion possible
+	 * @return boolean true if the expression's value is constant and evaluates to true, false otherwise
 	 */
 	abstract public function IsTrue();
 
diff --git a/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php b/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php
index 06e69d1d7..a92e34260 100644
--- a/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php
+++ b/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php
@@ -34,23 +34,30 @@ $oModuleDesign = new ModuleDesign($_ENV['PORTAL_ID']);
 
 // Load portal conf. such as properties, themes, templates, ...
 // Append into %combodo.portal.instance.conf%
+$oKPI = new ExecutionKPI();
 $oBasicCompat = new Basic($oModuleDesign);
 $oBasicCompat->Process($container);
+$oKPI->ComputeAndReport('Load portal conf. such as properties, themes, templates, ...');
 
 // Load portal forms definition
 // Append into %combodo.portal.instance.conf%
+$oKPI = new ExecutionKPI();
 $oFormsCompat = new Forms($oModuleDesign);
 $oFormsCompat->Process($container);
+$oKPI->ComputeAndReport('Load portal forms definition');
 
 // Load portal lists definition
 // Append into %combodo.portal.instance.conf%
+$oKPI = new ExecutionKPI();
 $oListsCompat = new Lists($oModuleDesign);
 $oListsCompat->Process($container);
+$oKPI->ComputeAndReport('Load portal lists definition');
 
 // Generating CSS files
 // Note: We do this here as it is not user dependent and therefore can be cached for everyone.
 // A dedicated listener 'CssFromSassCompiler' exists to compile files again when by-passing HTTP cache.
 // This is to keep developers comfort when tuning the SCSS files.
+$oKPI = new ExecutionKPI();
 $aImportPaths = array($_ENV['COMBODO_PORTAL_BASE_ABSOLUTE_PATH'].'css/');
 $aPortalConf = $container->getParameter('combodo.portal.instance.conf');
 foreach ($aPortalConf['properties']['themes'] as $sKey => $value)
@@ -71,4 +78,6 @@ foreach ($aPortalConf['properties']['themes'] as $sKey => $value)
 		$aPortalConf['properties']['themes'][$sKey] = $aValues;
 	}
 }
+$oKPI->ComputeAndReport('Generating CSS files');
+
 $container->setParameter('combodo.portal.instance.conf', $aPortalConf);
\ No newline at end of file
diff --git a/datamodels/2.x/itop-portal-base/portal/public/index.php b/datamodels/2.x/itop-portal-base/portal/public/index.php
index 04d090984..b9b7539d2 100644
--- a/datamodels/2.x/itop-portal-base/portal/public/index.php
+++ b/datamodels/2.x/itop-portal-base/portal/public/index.php
@@ -24,23 +24,38 @@ require_once MODULESROOT.'itop-portal-base/portal/config/bootstrap.php';
 
 // Stacking context tag so it knows we are in the portal
 $oContext = new ContextTag(ContextTag::TAG_PORTAL);
-$oContext2 = new ContextTag('Portal:' . $_ENV['PORTAL_ID']);
+$oContext2 = new ContextTag('Portal:'.$_ENV['PORTAL_ID']);
+
+
+$oKPI = new ExecutionKPI();
 
 // Note: Manually refactored ternary condition to be PHP 5.x compatible
-if ($trustedProxies = isset($_SERVER['TRUSTED_PROXIES']) ? $_SERVER['TRUSTED_PROXIES'] : (isset($_ENV['TRUSTED_PROXIES']) ? $_ENV['TRUSTED_PROXIES'] : false))
-{
+if ($trustedProxies = isset($_SERVER['TRUSTED_PROXIES']) ? $_SERVER['TRUSTED_PROXIES'] : (isset($_ENV['TRUSTED_PROXIES']) ? $_ENV['TRUSTED_PROXIES'] : false)) {
 	Request::setTrustedProxies(explode(',', $trustedProxies), Request::HEADER_X_FORWARDED_ALL ^ Request::HEADER_X_FORWARDED_HOST);
 }
 
 // Note: Manually refactored ternary condition to be PHP 5.x compatible
-if ($trustedHosts = isset($_SERVER['TRUSTED_HOSTS']) ? $_SERVER['TRUSTED_HOSTS'] : (isset($_ENV['TRUSTED_HOSTS']) ? $_ENV['TRUSTED_HOSTS'] : false))
-{
+if ($trustedHosts = isset($_SERVER['TRUSTED_HOSTS']) ? $_SERVER['TRUSTED_HOSTS'] : (isset($_ENV['TRUSTED_HOSTS']) ? $_ENV['TRUSTED_HOSTS'] : false)) {
 	Request::setTrustedHosts([$trustedHosts]);
 }
 
 $oKernel = new Kernel($_SERVER['APP_ENV'], (bool)$_SERVER['APP_DEBUG']);
+$oKPI->ComputeAndReport('Symfony kernel init');
+
+$oKPI = new ExecutionKPI();
 $oRequest = Request::createFromGlobals();
+$oKPI->ComputeAndReport('Symfony request parsing/creation');
+
+$oKPI = new ExecutionKPI();
 /** @noinspection PhpUnhandledExceptionInspection */
 $oResponse = $oKernel->handle($oRequest);
 $oResponse->send();
+$oKPI->ComputeAndReport('Page execution and rendering');
+
+
+$oKPI = new ExecutionKPI();
 $oKernel->terminate($oRequest, $oResponse);
+$oKPI->ComputeAndReport('Symfony kernel termination');
+
+
+ExecutionKPI::ReportStats();
\ No newline at end of file