I don't have specifics since it's been months, but LiteLLM on a hetzner server, deployed through Coolify was using 1-4 GB (cannot exactly, and dont know why either).
Bifrost feels very light, though.
Will try LiteLLM if it's in Rust.
Would also appreciate a slicker aesthetic. I got used to Bifrost shadcn with 0 border radius.