I made some computations, I skip the details for now, but the result was a 
rational function with rational coefficients and 13 indeterminates. The 
computation took around three hours and used a lot of memory so I made it 
using a script. The first time I saved the rational function in a pickle 
file, the second time in a sobj file. The first one was 1.2Gb, the second 
one around 300Mb. The main issue is that opening a sage session (or using a 
script) takes much more time than computing (with pickle more than 12 
hours, I stopped it, with sobj 10 hours and counting). I did not try a text 
file, but I wonder which is the best strategy to save a heavy result and 
being able to load it using less time than the actual computation.

Ideas would be appreciated. Thanks, Enrique Artal.

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