Faced with 50001 error, how can I resolve this and understand what rollup trigger the issue is?

trigger RHX_Investments on Investments__c 

    (after delete, after insert, after undelete, after update, before delete) { 

         Type rollClass = System.Type.forName('rh2', 'ParentUtil'); 

        if(rollClass != null) { 

              rh2.ParentUtil pu = (rh2.ParentUtil) rollClass.newInstance(); 

         if (trigger.isAfter) { 

                        pu.performTriggerRollups(trigger.oldMap, trigger.newMap, new String[]{'Investments__c'}, null); 

     } 

    } 

}