I am just posting my performance numbers. Hopefully you all find it helpful. I am running Guix System on a Lenovo Thinkpad T400 with 8GB on a hard drive. #+BEGIN_SRC sh :results output :exports both guix describe #+END_SRC #+RESULTS: #+begin_example Generation 49 Oct 20 2020 01:15:33 (current) my-personal-packages 547d900 repository URL: https://notabug.org/jbranso/guix-packages.git branch: master commit: 547d900c25d2bb9490946162e0fcb315d6bace68 guix 93c2518 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 93c251818dcd2bf5f60f42e595504293ee83371a GUIX_PACKAGE_PATH="/home/joshua/prog/gnu/guix/guix-packages/" #+end_example The "XDG MIME database" takes a while. #+BEGIN_SRC sh :results output :exports both time guix build --check $(guix gc -R $(guix gc --derivers $(readlink -f ~/.guix-profile)) |grep xdg-mime-database.drv) #+END_SRC #+RESULTS: : The following profile hook will be built: : /gnu/store/lmhklgdscbfp5c6gl81skyz0azfg156m-xdg-mime-database.drv : building XDG MIME database... : successfully built /gnu/store/lmhklgdscbfp5c6gl81skyz0azfg156m-xdg-mime-database.drv : successfully built /gnu/store/lmhklgdscbfp5c6gl81skyz0azfg156m-xdg-mime-database.drv : /gnu/store/x8q8g9l0jhrpmjjm3xsh3ib1z8l79cyx-xdg-mime-database : : real 0m43.716s : user 0m3.626s : sys 0m0.258s Cold cache: #+BEGIN_SRC sh :results output :exports both drv="$(guix gc -R $(guix gc --derivers $(readlink -f ~/.guix-profile)) |grep xdg-mime-database.drv)" sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' time guix build --check "$drv" #+END_SRC #+RESULTS: : The following profile hook will be built: : /gnu/store/lmhklgdscbfp5c6gl81skyz0azfg156m-xdg-mime-database.drv : building XDG MIME database... : successfully built /gnu/store/lmhklgdscbfp5c6gl81skyz0azfg156m-xdg-mime-database.drv : successfully built /gnu/store/lmhklgdscbfp5c6gl81skyz0azfg156m-xdg-mime-database.drv : /gnu/store/x8q8g9l0jhrpmjjm3xsh3ib1z8l79cyx-xdg-mime-database : : real 1m29.606s : user 0m1.401s : sys 0m0.238s I have 64 packages in my profile. #+BEGIN_SRC sh :results output :exports both guix package -I | wc --lines #+END_SRC #+RESULTS: : 64 If you want to see all packages: #+BEGIN_SRC sh :results output :exports both guix package -I #+END_SRC #+RESULTS: #+begin_example guile-colorized 0.1 out /gnu/store/5h0jfssgyx49cq82wrmw57an7ngb7kkz-guile-colorized-0.1 font-hack 3.003 out /gnu/store/52r8anazd4rnkq9m3vxk700jga5h0i74-font-hack-3.003 font-dejavu 2.37 out /gnu/store/7y3lvk3xf4im8n44337mc6y0ccysvfia-font-dejavu-2.37 font-adobe-source-code-pro 2.030R-ro-1.050R-it out /gnu/store/l5m74158njcan3p784gqhkir6zyk0bcp-font-adobe-source-code-pro-2.030R-ro-1.050R-it sicp 20170703-1.225c172 out /gnu/store/x2safq6fvcbhp2rljny89qiq74y1xd13-sicp-20170703-1.225c172 unzip 6.0 out /gnu/store/1zx8knb7h79q6cr4kwhbz6z6v609309w-unzip-6.0 font-google-noto 20171025 out /gnu/store/g2szydnbvs7qqy2nf7qylba0rapajmd8-font-google-noto-20171025 font-awesome 4.7.0 out /gnu/store/gknn01i1nr80apmcx42w36cqcz3zzri2-font-awesome-4.7.0 texinfo 6.7 out /gnu/store/w8k9hcigvhzrlrblv8lgqj77sm3833rs-texinfo-6.7 gcc-toolchain 10.2.0 out /gnu/store/pknm43xsza6nlc7bn27djip8fis92akd-gcc-toolchain-10.2.0 recutils 1.8 out /gnu/store/qlx179h9mfdv4zywx2ias2jmkygvs834-recutils-1.8 guile-readline 3.0.2 out /gnu/store/va6l1ivclww22fi38w5h99pb4ndn99hg-guile-readline-3.0.2 gtypist 2.9.5 out /gnu/store/03wd707lyz49f2r14cm9ybyzh7vfvi0j-gtypist-2.9.5 scsh 0.0.0-1.1144324 out /gnu/store/57frd08q6gyd7ysq3aqwlxxmify3w53h-scsh-0.0.0-1.1144324 make 4.3 out /gnu/store/4k33n2nhsnnaxk2ip75gj7xiqdjns5hq-make-4.3 isync 1.3.3 out /gnu/store/745qmx9mmnwq0j3zrd50qcdd2bgv5clz-isync-1.3.3 jmacs 27.1 out /gnu/store/0hqdddkvhi2acxjdssdi5as3wj6cgvnz-jmacs-27.1 glibc-locales 2.31 out /gnu/store/x9c4dk4zc9mi5j9hm3lq1q539kkdhkln-glibc-locales-2.31 guile 3.0.4 out /gnu/store/ah16zr8mmfkqy23rr7jy5a842ca1q9h1-guile-3.0.4 guile-json 4.3.2 out /gnu/store/12y1s0p3585ydf336gq85kjh5217pnzp-guile-json-4.3.2 guile-syntax-highlight 0.1 out /gnu/store/dwjqscckpypqfq38hc97x5ipc9fplpp9-guile-syntax-highlight-0.1 haunt 0.2.4 out /gnu/store/ccvqa9a6yclgkpi9izhpgf1vgjaghqvr-haunt-0.2.4 gnutls 3.6.14 out /gnu/store/0f6agk6xk8rcz99907d39nd1vzmc4abq-gnutls-3.6.14 wget 1.20.3 out /gnu/store/d7b16jqrgb1jz65hl7vnz261dbxmjh3s-wget-1.20.3 gnupg 2.2.23 out /gnu/store/89cjqnar4aacg58wl6cm1h41rym9mv4l-gnupg-2.2.23 sassc 3.6.1 out /gnu/store/6pqn2i0r12ypss13mdvsypskkcpaagji-sassc-3.6.1 qterminal 0.15.0 out /gnu/store/y7qrfa78y785xfajb3gvvhwcm2d02l81-qterminal-0.15.0 dmenu 5.0 out /gnu/store/393frjc5xjaab6nvp3wxpajb1rc6gynr-dmenu-5.0 openssh 8.4p1 out /gnu/store/k8lnv9cqk6m15k18hhzg7w696r1vxx1v-openssh-8.4p1 grim 1.3.1 out /gnu/store/9v5i9q7kwcmq1q31qri0icjkhh3csh9r-grim-1.3.1 evince 3.36.5 out /gnu/store/arwvpbrzsch4w6afkpqln6625dfl0bz8-evince-3.36.5 pulseaudio 13.0 out /gnu/store/19wcjfwdr3hzq1a4wcpld1zdrjichck0-pulseaudio-13.0 libreoffice 6.4.6.2 out /gnu/store/7rbk52nzqmakd5whds5a6f07xrd2k870-libreoffice-6.4.6.2 termite 15 out /gnu/store/8lqfy0mxqnq3xg24gwsxvzpxnvv6firh-termite-15 mpv 0.32.0 out /gnu/store/2i2gzn7fa8qq0f1jkqhiyl0xw63fjr4w-mpv-0.32.0 pinentry 1.1.0 out /gnu/store/bdsk9yq48lx1f7y7xr9sv4yrmm4ync9b-pinentry-1.1.0 glib 2.62.6 doc /gnu/store/ql2226knbh4q04bbdiqcppvs5rjyl3ga-glib-2.62.6-doc pidgin 2.13.0 out /gnu/store/fd06njmc5maid7b474v224iazy7bc20h-pidgin-2.13.0 gimp 2.10.20 out /gnu/store/m397hvwhsd0l6v5d0vqxxkm4iyp0p9w3-gimp-2.10.20 sway 1.4 out /gnu/store/27ggd92in0hpgmkgk79n2iy4angjxwvl-sway-1.4 wf-recorder 0.2.1 out /gnu/store/glc6y75l4czpfyrgbrbgxg38ig004v1p-wf-recorder-0.2.1 wofi 1.1.2 out /gnu/store/qaylx0k6wg3awsamn2rqr41q9c8iwypg-wofi-1.1.2 linphoneqt 4.1.1 out /gnu/store/wlcviacpagxqnw1737x131if0fj7kzjv-linphoneqt-4.1.1 qbittorrent 4.2.5 out /gnu/store/29cjbdmz809pdvmylbx307l2p7zv0ma9-qbittorrent-4.2.5 pavucontrol 4.0 out /gnu/store/0ilm4lncr6gpg4h3zdvaxg1pibkm6934-pavucontrol-4.0 git 2.28.0 send-email /gnu/store/g5x559qk5yxs19jcxqplqv8b9y32vak2-git-2.28.0-send-email flatpak 1.8.2 out /gnu/store/ywfsnccvlr0j6afb5vnl3z4ismvcfbz6-flatpak-1.8.2 xdg-desktop-portal 1.7.2 out /gnu/store/jkjx5dd7s3dp58p2hwsm8n2rm15z90ys-xdg-desktop-portal-1.7.2 xdg-desktop-portal-gtk 1.7.1 out /gnu/store/zhssisyp66vggjnqi5y8nb1xnk55vnw1-xdg-desktop-portal-gtk-1.7.1 xeyes 1.1.2 out /gnu/store/4jx8i19xd94d421n4acy2c1p0nn9h6d0-xeyes-1.1.2 emacs-polymode 0.2 out /gnu/store/gmm1y1xahg44yw9ghsf0kwd40w86q7mf-emacs-polymode-0.2 notmuch 0.31 out /gnu/store/0js5dwj8nxj0x0hxfllgzz4zxlsmyrz4-notmuch-0.31 msmtp 1.8.12 out /gnu/store/s1g4nskvnsx9ww0032xg23548h7mnwvq-msmtp-1.8.12 youtube-viewer 3.7.9 out /gnu/store/jm7q53lpda3a4rs2z7xv7cgig7adpncb-youtube-viewer-3.7.9 guile-curl 0.6 out /gnu/store/9nnclxjxakwx9yc381arqrk1nhld21b5-guile-curl-0.6 qemu 5.1.0 out /gnu/store/qzi36f60d2zlrdj9mg6b5y4i00w1fzfq-qemu-5.1.0 icecat 78.3.1-guix0-preview1 out /gnu/store/71fkykdajhkshsvzwrnqm4lsc6qgycg2-icecat-78.3.1-guix0-preview1 git 2.28.0 out /gnu/store/j66k3x1wz0bc6nh09dwa6i4jwahqcabi-git-2.28.0 guix 1.1.0-29.4e3ed9b out /gnu/store/irirj169rncank4y7i6n8qyiiqbs76qr-guix-1.1.0-29.4e3ed9b ffmpeg 4.3.1 out /gnu/store/sg4yq9i0v1lphvs1vx33dw9mn801adrd-ffmpeg-4.3.1 pavucontrol-qt 0.15.0 out /gnu/store/9d0zp4wps5kpbqsl4yvjb96spb5xwz9b-pavucontrol-qt-0.15.0 clementine 1.3.1-2.4619a4c out /gnu/store/5392fysgmmi2jmn98maz9ihzn9ahzhw9-clementine-1.3.1-2.4619a4c mako 1.4 out /gnu/store/k83v9wz6szf6k2p2sz1amvwqm687j3h2-mako-1.4 ungoogled-chromium 86.0.4240.75-0.c34a56d out /gnu/store/m0s9mrbirbssis5nn9agx8k4sl2ck0y9-ungoogled-chromium-86.0.4240.75-0.c34a56d #+end_example Thanks, -- Joshua Branson Sent from Emacs and Gnus https://gnucode.me https://video.hardlimit.com/accounts/joshua_branson/video-channels "You can have whatever you want, as long as you help enough other people get what they want." - Zig Ziglar