I really wasn't using Composer for last couple of years. Did it already stopped eating 2GB RAM for any project that use framework like Laravel?

Composer is a good tool, but it's resource usage was abysmal.

2G of ram at build is not that outrageous, however yes, with composer2 (released like 7 years ago?) it uses less ram. Also the frameworks got less bloated and more modular

Yes it did. Composer 2 is way lighter and faster