ipables and caching

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I have a legacy application which forwards lots of packets (router,
essentially) and uses a lot of sometimes badly written autogenerated
iptables rules (about 3,000 of them).

I am seeing on a good day high route cache efficiency. Do packets
which do not follow the slow path (i.e. cache hits) also cache
what iptables rules they hit? Nothing fancy in use bar conn_track.
If not, is there some magic wand I can use (other than a rewrite,
which has already been done but can't be used in some circumstances)
to speed up rule processing?

--
Alex Bligh
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