Packages delta'd: acpid-2.0.20-1-x86_64.pkg.tar.xz acpid-2.0.21-1-x86_64.pkg.tar.xz boost-1.54.0-4-x86_64.pkg.tar.xz boost-1.55.0-2-x86_64.pkg.tar.xz calligra-libs-2.8.0-1-x86_64.pkg.tar.xz calligra-libs-2.8.0-2-x86_64.pkg.tar.xz ffmpeg-1:2.1-2-x86_64.pkg.tar.xz ffmpeg-1:2.1-3-x86_64.pkg.tar.xz flashplugin-11.2.202.336-1-x86_64.pkg.tar.xz flashplugin-11.2.202.341-1-x86_64.pkg.tar.xz gcc-multilib-4.8.2-7-x86_64.pkg.tar.xz gcc-multilib-4.8.2-8-x86_64.pkg.tar.xz gedit-3.10.3-1-x86_64.pkg.tar.xz gedit-3.10.4-1-x86_64.pkg.tar.xz imagemagick-6.8.8.6-1-x86_64.pkg.tar.xz imagemagick-6.8.8.7-1-x86_64.pkg.tar.xz kdelibs-4.12.2-1-x86_64.pkg.tar.xz kdelibs-4.12.3-1-x86_64.pkg.tar.xz libpng-1.6.10-1-x86_64.pkg.tar.xz libpng-1.6.9-1-x86_64.pkg.tar.xz libreoffice-base-4.1.4-3-x86_64.pkg.tar.xz libreoffice-base-4.1.5-1-x86_64.pkg.tar.xz libreoffice-calc-4.1.4-3-x86_64.pkg.tar.xz libreoffice-calc-4.1.5-1-x86_64.pkg.tar.xz linux-3.13.5-1-x86_64.pkg.tar.xz linux-3.13.6-1-x86_64.pkg.tar.xz linux-firmware-20140123.418320b-1-any.pkg.tar.xz linux-firmware-20140217.343e460-1-any.pkg.tar.xz man-pages-3.60-1-any.pkg.tar.xz man-pages-3.61-1-any.pkg.tar.xz mariadb-clients-5.5.35-1-x86_64.pkg.tar.xz mariadb-clients-5.5.36-1-x86_64.pkg.tar.xz openjdk7-doc-7.u51_2.4.4-1-x86_64.pkg.tar.xz openjdk7-doc-7.u51_2.4.5-1-x86_64.pkg.tar.xz pacman-4.1.2-4-x86_64.pkg.tar.xz pacman-4.1.2-5-x86_64.pkg.tar.xz pidgin-2.10.8-2-x86_64.pkg.tar.xz pidgin-2.10.9-1-x86_64.pkg.tar.xz python2-2.7.6-2-x86_64.pkg.tar.xz python2-2.7.6-3-x86_64.pkg.tar.xz ruby-2.1.0-2-x86_64.pkg.tar.xz ruby-2.1.1-1-x86_64.pkg.tar.xz subversion-1.8.5-3-x86_64.pkg.tar.xz subversion-1.8.8-1-x86_64.pkg.tar.xz systemd-210-2-x86_64.pkg.tar.xz systemd-210-3-x86_64.pkg.tar.xz texlive-formatsextra-2013.30214-1-any.pkg.tar.xz texlive-formatsextra-2013.31958-1-any.pkg.tar.xz valgrind-3.9.0-1-x86_64.pkg.tar.xz valgrind-3.9.0-2-x86_64.pkg.tar.xz vlc-2.1.3-1-x86_64.pkg.tar.xz vlc-2.1.4-1-x86_64.pkg.tar.xz xbmc-12.3-11-x86_64.pkg.tar.xz xbmc-12.3-12-x86_64.pkg.tar.xz xf86-video-ark-0.7.5-3-x86_64.pkg.tar.xz xf86-video-ark-0.7.5-4-x86_64.pkg.tar.xz zsh-5.0.2-4-x86_64.pkg.tar.xz zsh-5.0.5-1-x86_64.pkg.tar.xz xdelta3 -q -f -s (-9) in k: 20 (16) acpid-2.0.20-1_to_acpid-2.0.21-1.delta 13104 (11744) boost-1.54.0-4_to_boost-1.55.0-2.delta 364 (336) calligra-libs-2.8.0-1_to_calligra-libs-2.8.0-2.delta 792 (728) ffmpeg-1:2.1-2_to_ffmpeg-1:2.1-3.delta 2628 (2512) flashplugin-11.2.202.336-1_to_flashplugin-11.2.202.341-1.delta 11252 (10176) gcc-multilib-4.8.2-7_to_gcc-multilib-4.8.2-8.delta 436 (384) gedit-3.10.3-1_to_gedit-3.10.4-1.delta 612 (548) imagemagick-6.8.8.6-1_to_imagemagick-6.8.8.7-1.delta 6412 (5424) kdelibs-4.12.2-1_to_kdelibs-4.12.3-1.delta 104 (100) libpng-1.6.10-1_to_libpng-1.6.9-1.delta 1504 (1452) libreoffice-base-4.1.4-3_to_libreoffice-base-4.1.5-1.delta 5060 (4228) libreoffice-calc-4.1.4-3_to_libreoffice-calc-4.1.5-1.delta 47188 (46736) linux-3.13.5-1_tp_linux-3.13.6-1.delta 1128 (1104) man-pages-3.60-1_to_man-pages-3.61.delta 540 (496) mariadb-clients-5.5.35_to_mariadb-clients-5.5.36.delta 18172 (14360) openjdk7-doc-7.u51_2.4.4-1_to_openjdk7-doc-7.u51_2.4.5-1.delta 44 (44) pacman-4.1.2-4_to_pacman-4.1.2-5.delta 120 (112) pidgin-2.10.8-2_to_pidgin-2.10.9-1.delta 372 (352) python2-2.7.6-2_to_python2-2.7.6-3.delta 1228 (1108) ruby-2.1.0-2_to_ruby-2.1.1-1.delta 540 (476) subversion-1.8.5-3_to_subversion-1.8.8-1.delta 816 (740) systemd-210-2-_to_systemd-210-3.delta 12 (12) texlive-formatsextra-2013.30214-1_to_texlive-formatsextra-2013.31958-1.delta 8180 (7400) valgrind-3.9.0-1_to_valgrind-3.9.0-2.delta 3932 (3692) vlc-2.1.3-1_to_vlc-2.1.4-1.delta 168 (160) xbmc-12.3-11_to_xbmc-12.3-12.delta 8 (8) xf86-video-ark-0.7.5-3-_to_xf86-video-ark-0.7.5-4.delta 944 (892) zsh-5.0.2-4-x86_64_to_zsh-5.0.5-1.delta time (time) and peak memory consuption (while true ; do ; ps_mem | grep xdelta ; done ) while composing packages from delta: xdelta3 (-9) -q -f -s : acpid: 0.121s, too fast (0m0.112s, too fast) boost: 1m20.219s, 85.3 MiB (1m19.629s, 80.3 MiB) calligra-libs: 0m10.975s, 16.4 MiB (0m10.289s, 16.4 MiB) ffmpeg: 0m11.624s, 19.9 MiB (0m11.951s, 19.8 MiB) flashplugin: 0m19.083s, 33.5 MiB (0m19.549s, 33.4 MiB) gcc-multilib: 1m8.137s, 84.9 MiB (1m3.846s, 80.8 MiB) gedit: 0m9.216s, 19.1 MiB (0m9.355s, 19.0 MiB) imagemagic: 0m7.125s, 12.8 MiB (0m7.544s, 12.8 MiB) kdelibs: 0m46.660s, 68.5 MiB (0m47.704s, 67.5 MiB) libpng: 0m0.363s, too fast (0m0.405s, too fast) libreoffice-base: 0m8.988s, 16.0 MiB (0m8.776s, 15.9 MiB) libreoffice-calc: 0m20.316s, 30.9 MiB (0m20.166s, 30.1 MiB) linux: 0m45.753s, 92.4 MiB (0m47.502s, 87.3 MiB) man-pages: 0m4.197s, 14.3 MiB (0m4.296s, 14.2 MiB) mariadb-clients: 0m6.221s, 21.6 MiB (0m6.461s, 21.5 MiB) openjdk7-doc: 1m38.915s, 88.7 MiB (1m40.888s, 86.9 MiB) pacman: 0m2.143s, 4.3 MiB (0m2.115s, 4.3 MiB) pidgin: 0m2.553s, 6.0 MiB (0m2.741s, 6.0 MiB) python: 0m48.090s, 71.0 MiB (0m48.613s, 71.0 MiB) ruby: 0m14.514s, 23.4 MiB (0m14.678s, 23.3 MiB) subversion: 0m25.814s, 36.5 MiB (0m25.852s, 36.4 MiB) systemd: 0m13.930s, 21.5 MiB (0m13.330s, 21.4 MiB) texlive-formatsextra: 0m0.755s, too fast (0m0.730s, 1.4 MiB) valgrind: 0m40.352s, 69.4 MiB (0m40.980s, 68.6 MiB) vlc: 0m34.229s, 56.6 MiB (0m34.159s, 56.4 MiB) xbmc: 0m44.762s, 66.2 MiB (0m45.335s, 66.2 MiB) xf86-video-ark: 0m0.044s, too fast (0m0.041s, too fast) zsh: 0m4.045s, 8.1 MiB (0m3.929s, 8.0 MiB) Note that not all of the listed deltas actually are "worth it", as they are bigger than the new package and would be deleted. Also my system is not the latest, CPU: Intel Core 2 Duo CPU P8600 (2.4Ghz)