[Haskell-cafe] cereal vs. binary

[braver]

I dump results of a computation as a Data.Trie of [(Int,Float)].  It
contains about 5 million entries, with the lists of 35 or less pairs
each.  It takes 8 minutes to load with Data.Binary and lookup a single
key.  What can take so long?  If I change from compressed to
uncompressed (and then decode), it's the same time...  It's not IO,
CPU is loaded 100%.

I'm now thinking of using cereal.  Given I have Data.Binary in place,
what needs to be changed to work with cereal?  Is it binary-
compatible?  How can one construct a cereal instance for Data.Trie?

-- Alexy