I just went through the process of converting my map-based program over to
records, hoping it would improve speed. Much to my dismay, it actually
slowed my program down substantially. With some profiling, I discovered
that one possible explanation is that (at least in RC4) hashing of records
is about 60x slower than their map-based counterpart.
(defrecord A [x y])
=> (time (dotimes [n 10000000] (hash {:x "a" :y 3})))
"Elapsed time: 90.631072 msecs"
=> (time (dotimes [n 10000000] (hash (A. "a" 3))))
"Elapsed time: 5549.788311 msecs"
Any thoughts about why this is the case?
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