Analog computers are systems that perform computations by manipulating physical quantities such as electrical current, that ...

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.

I've run into a problem with my project with both the speed and accuracy with a home brew matrix class using doubles. I'm inverting a matrix and multiplying it by a vector and transposed vector. When ...