customize pdf in vtiger

Hi: a) there is a text field that currently shows in quote, sales order and invoice then exporting this templates in vtiger ... this line (upper right) must be eliminated and replaces by a text field from vtiger database .. we moved some time ago and still the old office data is shown. Please see image on attached file, it shows invoice as an example but has to be done on invoice, quote and salesorder .. b) also I would like to eliminate old data from document tab and mail tab .. there are too many .. also I would like to improve server performance, procesor is running far too high so it is probably slow because of that .. c) and you may suggest ways to handle/improve mail sending (we use vtiger webmail interface) .. unfortunatly mail sending is very slow and while the mail si send users cannot open or work on other windows .. maybe there is a way to improve that .. actually it does not matter how long it takes to send the mail but users should be able to work on other tabs in vtiger during transmision.. also NOT PART OF THIS PROJECT: if you show a good job, I might be interested to improve other aspects on vtiger: maybe upgrade to other version, move to a different server, regards Klaus Amrehn