Modifying a pdf

[Sam Karpouzos]

Hi Guys,
I am working on modifying text in a pdf and have some concerns about 
performance. The majority of the processing time is taken up in loading and 
saving the doc (which makes sense).
I can't really see getting around not parsing the entire page as I need to look 
for text and even replace a font if necessary. But. On the save, is there a way 
for me to just save the tokens that I changed. Kind of like a RandomAccessFile.