Speeding up APFEL++ evolution

src/partons/modules/evolution/gpd/GPDEvolutionApfel.cpp

@@ -106,7 +106,7 @@ PartonDistribution GPDEvolutionApfel::compute(GPDModule* pGPDModule, const GPDTy
     // Set initial scale
     m_MuF2_ref = pGPDModule->getMuF2Ref();
 
-    //if (m_xi != m_xi_prev)
+    if (m_xi != m_xi_prev)
       {
 	// Get thresholds. Set to zero whatever is below one.
 	std::vector<double> thresholds;
@@ -284,6 +284,9 @@ GPDEvolutionApfel::GPDEvolutionApfel(const GPDEvolutionApfel &other) :
 void GPDEvolutionApfel::initModule() {
     GPDEvolutionModule::initModule();
 
+    if (m_xi != m_xi_prev)
+      {
+
 	// Silence APFEL
 	apfel::SetVerbosityLevel(0);
 
@@ -295,6 +298,7 @@ void GPDEvolutionApfel::initModule() {
 
 	// Running coupling
 	m_as = [=] (double const& mu) -> double{ return getRunningAlphaStrongModule()->compute(mu * mu); };
+      }
 }
 
 void GPDEvolutionApfel::isModuleWellConfigured() {