Customizing Title

Hi,

I have a requirement in billing invoice to refer table

VBFA-vbeln = is_bil_invoice-hd_gen-bil_number AND

vbtyp_n = 'M'.

then go VBAK table VBAK vbeln = wa_vbfa-vbelv AND

auart = 'FD'.

if successful then print the Title as Proforma Invoice else just print Invoice .

My query is that while selecting data from VBFA it is taking a lot of time , how to reduce this time and secondly how to show the o/p as "Proforma Invoice" or "Invoice"

Thank You,

SB.