Reading the file very slow through BDC Session method

Hi Experts,

I am uploading 70,000 records for Vl01 (delivery) through bdc session method but it is very slow ,for reading the file and for creating session it is

taking longtime ,i have kept in code

*clear : itab, it_bdcdata.

* wait up to 2 seconds.

if i keep these code means records are all are processed but it taking too much time so long for reading flat file and creating session taking 1 to 2 day for reading it self and creating sessions,

but when i trying to remove above code , for fast reading the file and creating sesion quickly, records

are not processed ,only first record only processed remaining records are showing incorrect,

please any body suggest me on these.

thanks in advance

prasad