T-CODE LT22 when executed takes long time ?

Hi,

Currently we are facing a issue . In transaction LT22, depending on selection criteria, the report will time out. Need to know why if the ''source'' and ''dest'' buttons are not checked, the program takes so long. Also, if ''all TO items'' is checked, the program also takes too long.

Please guide me how to improve the performance of the program.

Thanks in advance.

Vengal Rao