Slow BaSpaCho slover

## ❓ Questions and Help

Hi @luisenp ,

Thanks for your excellent lib and the BaSpaCho Solver! I just tested the code from #565 with 0.2.2dev from pip and also compiled 0.2.2 from source(also BaSpaCho). My experiment shows using BaSpaCho Solver will make the optimization slower than default solver. Could you please check whether it's a problem with my environment?

Best,
Weining

The report names the BaSpaCho Solver, issue #565, and versions 0.2.2dev and 0.2.2, but no source file, test, or entry point. Start by reproducing the comparison between BaSpaCho and the default solver in those versions and record the environment details. Done means determining whether the slowdown is reproducible and identifying whether it is an implementation or environment issue.

Written by the indexing model from the issue text.