[Exim] system filter limits

My system filter is getting pretty large.

I have many lines like so:

if $h_subject: contains "spam subject 1" or
$h_subject: contains "spam subject 2" or

etc..

Is there a size limit on the filter?
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Jim Pazarena    mailto:paz@qcislands.net
                http://www.qcislands.net/paz