Query Performance Issue Of Sql Server 2005 Mobile Edition On Device

Executing a select query with left outer joins etc takes .53 seconds to execute on sqlce 2.0.

Same query on sql 2005 mobile ed. takes 11 minutes .

on database having same data.

Sample query

SELECT routes.location,routes.equipment_type, routes.contract_type,

routes.maintenance_interval,routes.bank_description,routes.Unit_Des,

routes.Unit_no,max(task_last_completed.date_completed)as date1,min(case when

task_last_completed.due_date is NULL then getdate()-1 else due_date end) as

due_date FROM routes left outer join tasks on tasks.model = routes.model and

tasks.eqtyp = routes.equipment_type inner join task_by_contract_type on

tasks.task_id = task_by_contract_type.task_id and

task_by_contract_type.contract_type = routes.contract_type and

task_by_contract_type.model = routes.model left outer join

task_last_completed on routes.unit_no = task_last_completed.equipment_Id and

tasks.task_Id = task_last_completed.task_Id WHERE routes.location LIKE

'S153825-01%' group by

routes.location,routes.equipment_type,routes.contract_type,routes.maintenanc

e_interval,routes.bank_description,routes.unit_des,routes.unit_no ORDER BY

routes.location, routes.bank_description, routes.Unit_Des

WHY????????????????