> One thing I learned in grad school is you can do a stupendous number of floating point operations in the time it takes to serialize a matrix to ASCII numbers

> One thing I learned in grad school is you can do a stupendous number of floating point operations in the time it takes to serialize a matrix to ASCII numbers and deserialize it. Whatever it is you are doing with a JSON document might be slower than parsing it. > It's true that autovectorization accomplishes very little but specialized libraries could have a notable effect on perceived performance if they were widely developed and used. I mean, sure, but even if we take JSON as an example, in vast majority of cases it gets fed to a giant blob of JS driving even bigger blob of browser code. The cases where you do deserialization -> very little processing -> serialization are pretty rare. Sure, if it is already on chip might as well use it, but realistically savings will be in single digit percents.