TDHF is slow - parallelised poorly

[benroberts999]

TDHF (RPA) is much slower than I think it could be when Breit is included.
Not parallelised well.

[benroberts999]

I don't think the issue is with Breit, it just makes it more noticeable.
Probably stems from large number of small allocations; I think these mess with ability to parallelise efficiently