Drupal 8 and 9 core were already made compatible with Composer 2 back in May. Last week the Drupal package repository (packages.drupal.org) rolled out full support for Composer 2 as well. While Michael Anello did Drupal vs. Composer 2-alpha2 benchmarks in July and Malabya also did an even more detailed benchmark in July, various things have been improved in Composer 2 since July and the packages.drupal.org improvement should also show.