JohnB - If you look at LiteSpeed Enterprise Web Config on port 7088 (not sure if you can do this on OLS). LiteSpeed set a hard memory limit of 2047MB. I've never tried changing that and never needed to. There has always been a performance improvement compared with NGINX (GT Metrix C to A)and Fast Caching and (although less so) OLS (B to A). This is with Advanced configuration preset on both but with workers configured on Enterprise.
So I'm not sure there would be a performance detriment in 4GB vs 2GB unless it was a particularly high-traffic site.
But the main point of the post was - I've got LiteSpeed Enterprise on a $20/year Epyc Milan VPS, and wanted to share the news!
Thank you Enhance 😃