hi Cedric, 
has nothing to do with SSD... but 

> 
> All queries involves a Date Range Filter and a Publication Filter.
> We've used WrappingCachingFilters for the Publication Filter for there
> are only a limited number of combinations for this filter. For the
> Date Range Filter we just let it run every time which seems to be
> doing fine.


if you have possibility to sort your index once in a while on something like 
DateRange  you will be surprised how good OS File cache utilizes locality of 
reference... we had dramatic (ca 30%) improvements just by having index sorted 
once a week on the most used fields... depend on nature of your collection and 
is not always possible, but if possible, does the job. If this is also only 
used as boolean condition to select range of documents, not affecting score 
(guess not), give omitTf() a try, your index will be smaller as well  


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