Matrix models constitute a powerful nonperturbative framework in which quantum fields and the geometry of space–time are encoded in large matrices. Originally motivated by attempts to formulate string ...

Graphical models provide a robust framework for representing the conditional independence structure between variables through networks, enabling nuanced insight into complex high-dimensional data.

If you start naively without any library that avoids the problem then memory access is the problem. Have a look at how much effort is needed to avoid the problem, for example with blocking algorithms.