// ~5 times more memory is used than it occupies.
// Warn the user if there is less free memory than 30 sizes of a grid
// TODO: estimate memory usage in other modes and take current mode into account
// ~5 times more memory is used than it occupies.
// Warn the user if there is less free memory than 30 sizes of a grid
// TODO: estimate memory usage in other modes and take current mode into account