Short Description refers to the description which appears when you hover over the subject link of the request in the request list view. By default, while performing a search operation, the short description of a request would be searched. But when you have large amount of data, the performance of ServiceDeskPlus-MSP eventually decreases.
You can disable this feature by using the query,
update GlobalConfig set PARAMVALUE=’false’ where CATEGORY=’SearchShortDescription’ and PARAMETER=’Status’;