How to speed up work with psd site layouts on a weak PC?

Question

PSD

I welcome everyone.
I have a laptop that is not very fast, and I would like to know how to reduce the size of the psd file so that it takes less RAM and renders faster. Ready to work with a very compressed image, the main thing is that the original dimensions and proportions are preserved in the document.
How can this be done and does it make sense? Is there any advice on setting the "Cache Levels" and "Cache Fragment Size" options in fsh?
Thank you!