Use of Filter rules for news, slow

I'd occasionally used a filter rule (M-S-R-F)in the past as a killfile 
when reading news. The rule had

Current Folder Type = Folder List = {mewsserver/nntp}#news.groupname (2)
>From pattern      =   list of addresses (2 or 3)
Filter Action   = Delete

Now I wanted to add a new rule to discard news articles which are 
cross-posted to some other newsgroup (since they are just disturbances)

I created a new rule similar to the above, but instead of the From 
pattern, I used 

News pattern      = it.discussioni.litigi 

(i.e. messages posted to the groups in Folder List and crossposted to the 
latter group are marked as deleted)

Now the new rule seems to be taking much longer to execute than the other 
rule based on From (actually I originally put both patterns in the same 
rule, and that was taking even longer).

Any idea of the reason why it is taking long ? How to speed up ?

-- 
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Lucio Chiappetti - INAF/IASF - via Bassini 15 - I-20133 Milano (Italy)
For more info : http://www.iasf-milano.inaf.it/~lucio/personal.html
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