I think that it's related to attachment: every time you add an attachment, FP11 check if the name exist in a flat file on the application server and this could impact the performances.
If this the case for you, you need to empty this file.
thanks for your reply,
can you advice where can i find this file ?
long time didn't touch the FP11... I think in the workspace folder.
thanks for your activity,
i just know where is the issue, it was in the DB.
there was a query that run every one hour and take long time this is will cause a louk in the db.
i just run the below to know what is the query that run in a time then i found what is the query.
SELECT execquery.last_execution_time, execsql.text AS [Script], *
FROM sys.dm_exec_query_stats AS execquery
CROSS APPLY sys.dm_exec_sql_text(execquery.sql_handle) AS execsql
where execquery.last_execution_time between '2019-07-29 11:28:00.000' and '2019-07-29 12:35:00.000'
ORDER BY execquery.last_execution_time DESC