[Hugsun]

This looks perfect. I've found native sympy to be a little cumbersome to use.

[qorrect]

Same here, I've been slogging through with raw sympy this tool looks great.

How do I speed up the start time for it - any ideas? Recompile it with PyPy or similar?

[idanp]

I think PyPy usually has slower startup time. Need to try to defer some of the imports to be done in the background, see how good is the outcome. Feel free to open an issue in github.