'Course you already mentioned a custom encoding, so, yeah, fasl: 
https://docs.racket-lang.org/reference/fasl.html

> On Sep 14, 2016, at 3:47 PM, Jon Zeppieri <zeppi...@gmail.com> wrote:
> 
> I think reading and writing fasl should be faster, but don't expect the 
> format to be compatible across Racket versions.
> 
> Or, if you know some super-efficient encoding for your data, wrap it in a new 
> struct type and implement your own serialization.
> 
>> On Sep 14, 2016, at 3:38 PM, Jonathan Schuster <schus...@ccs.neu.edu> wrote:
>> 
>> I have some large (several GB worth) sets of values I'd like to persist 
>> across debugging runs of a program, rather than recomputing them each time. 
>> I'm currently doing this with the built-in "read" and "write", but is there 
>> a more efficient method, especially for reading the data back in?
>> 
>> I could of course come up with some kind of custom encoding, but that's 
>> likely not worth the effort in my case, so I'm wondering if there's any 
>> general purpose method already available in Racket (or in a package).
>> 
>> Thanks,
>> Jon
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