My LXD/C containers sorted by reverse RAM current/peak usage:

− Debian for Mastodon 1600MB/4000MB  
− Debian for Matrix-Synapse 1500MB/1600MB  
− Ubuntu for Plex 470MB/1500MB  
− Debian for Peertube 424MB/1140MB  
− Debian for Wordpress 340MB/1000MB  
− Ubuntu for NextCloud 270MB/1000MB  
− Ubuntu for Pixelfed 312MB/960MB  
− Ubuntu for Mayan EDMS 673MB/755MB  
− Debian for Tiny Tiny RSS 633MB/752MB  
− Debian for Matomo 274MB/720MB  
− Debian for Lychee/PHPMyLMB 180MB/560MB  
− Debian for Lutim 256MB/480MB  
− Debian for PrivateBin 220MB/346MB  
− Debian for Wordpress 220MB/340MB  
− Debian for Gitit 170MB/291MB  
− Debian for XMR miner 100MB/200MB  
− Debian for Bind 100MB/200MB  
− Alpine for HAProxy 100MB/170MB  
− Alpine for Weechat 85MB/104MB  
− Alpine for borgbackup 8MB/90MB