Hi Matt, thanks for the reply.

Is there a description of the write_to_disk function? For instance I'd like to know how much or if it will slow down the computation, as well as if a similar function exists for the C++ version (I haven't upgraded yet and don't want to before I finish this paper). Most importantly, does write_to_disk enable an increase in the effective memory (ram) at the processor level? This is my fundamental bottleneck, my maximum bond dimension M.

Regarding open boundaries -- yes, I am also going to try open boundaries, however it's unlikely to work due to the oscillations that appear in the entanglement. I'm looking for very small finite size corrections to central charge (the corrections are on the order of 10^-3 and the precision I'm going for is 10^-7).