Glenn Adams commented on FOP-2190:

i've implemented a portion of this patch already in FOP-2195, however I am not 
prepared to apply the code that switches between the DX/DP text drawing 
functions since it imposes a significant performance and memory allocation 
penalty in order to reduce PDF output size; in particular, the use of 
String.substring() will cause a great amount of additional String allocation 
that would not otherwise be present; in order to apply this additional 
optimization, I think we need to:

(1) create a PDF renderer configuration option that allows the user to express 
whether to optimize PDF size or processing speed;
(2) rewrite the proposed changes to not require additional string allocation;
> decrease PDF file size when CS are enabled 
> -------------------------------------------
>                 Key: FOP-2190
>                 URL: https://issues.apache.org/jira/browse/FOP-2190
>             Project: Fop
>          Issue Type: Improvement
>          Components: pdf
>    Affects Versions: 1.1, trunk
>            Reporter: Luis Bernardo
>         Attachments: fop-2190.patch
> when CS are enabled, the current code may make use of the operators Td and Tj 
> in situations where TJ would be appropriate leading to an increase in file 
> size. note: this happens in the PDFPainter.drawText(). 

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