Well, with the report it seems the memory usage by sql server seems to high..

Run the below queries to identify how much memory is consumed by SQL Server, each databases & objects occupied.

Buffer pages & corresponding RAM memory usage by SQL Server

======================================================

select count(*) AS Buffered_Page_Count

,count(*) * 8192 / (1024 * 1024) as Buffer_Pool_MB

from sys.dm_os_buffer_descriptors

How much memory is your each database consuming

===============================================

SELECT LEFT(CASE database_id

WHEN 32767 THEN 'ResourceDb'

ELSE db_name(database_id)

END, 20) AS Database_Name,

count(*)AS Buffered_Page_Count,

count(*) * 8192 / (1024 * 1024) as Buffer_Pool_MB

FROM sys.dm_os_buffer_descriptors

GROUP BY db_name(database_id) ,database_id

ORDER BY Buffered_Page_Count DESC

Objects which were consuming memory Inside the database:

======================================================

SELECT TOP 25

obj.[name],

i.[name],

i.[type_desc],

count(*)AS Buffered_Page_Count ,

count(*) * 8192 / (1024 * 1024) as Buffer_MB

-- ,obj.name ,obj.index_id, i.[name]

FROM sys.dm_os_buffer_descriptors AS bd

INNER JOIN

(

SELECT object_name(object_id) AS name

,index_id ,allocation_unit_id, object_id

FROM sys.allocation_units AS au

INNER JOIN sys.partitions AS p

ON au.container_id = p.hobt_id

AND (au.type = 1 OR au.type = 3)

UNION ALL

SELECT object_name(object_id) AS name

,index_id, allocation_unit_id, object_id

FROM sys.allocation_units AS au

INNER JOIN sys.partitions AS p

ON au.container_id = p.hobt_id

AND au.type = 2

) AS obj

ON bd.allocation_unit_id = obj.allocation_unit_id

LEFT JOIN sys.indexes i on i.object_id = obj.object_id AND i.index_id = obj.index_id

WHERE database_id = db_id()

GROUP BY obj.name, obj.index_id , i.[name],i.[type_desc]

ORDER BY Buffered_Page_Count DESC

Note: Having a clustered index the the objects is nothing but having a table in the memory

Refer link :- http://sqlserverplanet.com/troubleshooting/sql-server-slowness/