Gitea/Forgejo seem pretty snappy and lightweight (on the UI side at least. Reminds me of old GitHub before they went all in on clientside rendering)
Re:Gitlab is reportedly up for sale
by ReleaseCandidat on Tuesday August 13, 2024 @02:03AM
(#41232730)
It is, it's running fine as a mirror of my Codeberg and Github repos together with Postgres in a RISC-V Qemu VM running Debian, using less than 500MB.
Or Codeforge (Forĝejo, if self hosting).