Try to turn everything into arrays. Maps, hashmaps are convenient, but if possible, sort your data and use parallel arrays. Deques of fixed size turn into ring

Try to turn everything into arrays. Maps, hashmaps are convenient, but if possible, sort your data and use parallel arrays. Deques of fixed size turn into ring buffers. At work we have invented several data structures over the years with weird names and they all make use of some trick to shave off memory allocation times when working with time series.