convergence speed

[TimZhang001]

Thank you for your work, let me have a better understanding of LDM.
But I am very surprised, although there are some differences between your code and LDM code(https://github.com/CompVis/latent-diffusion), but the basic principles are the same, why your code can achieve very fast convergence and achieve a good effect (<5H), but the LDM code needs about (48H).