Data Loader Error - Apex CPU time limit exceeded.

Here is the code for the trigger itself - 

trigger Shift_OpportunityLineItemTrigger on OpportunityLineItem (before insert, before update, after insert, after update, after delete, after undelete) {
/* 
* Name          : Shift_OppLineTrigger
* Author        : Leonard Loo
* Description   : Apex Trigger that calculates the Unit Price based
*                 on the RevenueScheduler Type value
*
* Maintenance History: 
* Date - Name - Version - Remarks
* 2012/07/27 - Leonard Loo - Version 1.0 - No comments 
* 2013/08/11 - Hermes Yan  - Version 1.1 - Flat rate ignores quantity 
* 2014/01/03 - Hermes Yan  - Version 1.2 - Removal of update conditions.
* 2014/12/02 - Leonard Loo - Version 1.3 - Added Auto Scheduling and moved Unit Price calculation to its own class. Renamed trigger.
*/
     Shift_AutoScheduling AutoScheduler = new Shift_AutoScheduling();
     Map<String, Shift_Field_Trigger_List__c> theTriggerFields = Shift_Field_Trigger_List__c.getAll();
    if (trigger.isAfter && (trigger.isUpdate || trigger.isInsert || trigger.isUndelete)) { // 1.3 - Leonard Loo - Trigger autoscheduling if relevant fields are updated
        Map<Id, OpportunityLineItem> theLinesToScheduleMap = new Map<Id, OpportunityLineItem>();
        for (OpportunityLineItem oli : Trigger.new) {
            // Only schedule Line Items if Media Cost, Service Date, End Date or Total Price have changed
            Boolean toSchedule = Trigger.isInsert;
            if (Trigger.isUpdate ) {
                for (Shift_Field_Trigger_List__c f : theTriggerFields.values()) {
                    if (oli.get(f.Opportunity_Line_Item_Field__c) <> trigger.oldMap.get(oli.Id).get(f.Opportunity_Line_Item_Field__c)) {
                    toSchedule = true;
                        break;
                    }
                }
            }
            if (toSchedule) {
                 theLinesToScheduleMap.put(oli.Id, oli);
            }
        }
        if (!theLinesToScheduleMap.isEmpty()) { 
            // Note that we create an empty Map of Opportunity Line Item Schedules.
            // The second parameter of the CreateSchedules method is only used when calling the method from a trigger
            // on the Opportunity Line Item Schedule object. Passing an empty list indicates that we are calling this method from
            // the Opportunity Line Item Trigger.  
            AutoScheduler.CreateSchedules(theLinesToScheduleMap, new Map<Id, List<OpportunityLineItemSchedule__c>>(), trigger.isInsert, trigger.isUpdate);
        }
    } else if (trigger.isAfter && trigger.isDelete) {
        // Since we do not have a master-detail relationship between Opportunity Line Items and Schedules
        // we must simulate it by deleting the Schedules that have the same Opportunity Line Item Id as the Opportunity Line Item
        // being deleted
        AutoScheduler.DeleteSchedules(trigger.oldMap);
    }
}

Any help would be greatly appreciated.  Thanks so much in advance!