>> If you want to load the btree item into cache, you need to do
>>               item._p_activate()
> That's not going to work, since `item` is a tuple. I don't want to load
> the item itself into the cache, I just want the btree to be in the cache.

Er, to be clearer: my goal is for the preload to load everything into the
cache that the query mechanism might use.

It seems the bucket approach only takes ~10 seconds on the 350k-sized index
trees vs. ~60-90 seconds. This seems to indicate that less things end up
being pre-loaded...

- Claudiu
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