DoubleFloats has a fair few dependencies.
Like SpecialFunctions, Polynomials, QuadMath etc.
(including some like Intervals.jl which trigger a fairly high number of invalidations, thus making loading this slow).
Removing it should speed up loading a fair bit.

It is only used for

Which in turn only needs:

• Creation
• Conversion to float
• Multiply
• Divide
• ^

We could port just those functions across.
Or maybe there is another algorithm for x*10^y (integer x, y) that we can use that doesn't need it.