Hi, I runned gdb during the freeze and found that about 230 were used during this moment. I retrieved 9 bt during this moment (I tried to retrieve it on the whole period). http://nabble.documentfoundation.org/file/n3774132/bt.zip bt.zip Debian testing pc x86-64 (Linux kernel 3.1.0-1-amd64) autogen.lastrun : --with-system-boost <<< I use boost 1.48 --enable-symbols --enable-ext-barcode --enable-ext-diagram --enable-ext-google-docs --enable-ext-hunart --enable-ext-languagetool --enable-ext-nlpsolver --enable-ext-ct2n --enable-ext-numbertext --enable-ext-oooblogger --enable-ext-pdfimport --enable-postgresql-sdbc --enable-ext-presenter-console --enable-ext-presenter-minimizer --enable-ext-report-builder --enable-ext-scripting-beanshell --enable-ext-scripting-javascript --enable-ext-typo --enable-ext-validator --enable-ext-watch-window --enable-ext-wiki-publisher --enable-dbus --enable-graphite --enable-evolution2 --enable-werror --enable-debug --enable-dbgutil --enable-crashdump --enable-kde4 --enable-dependency-tracking --enable-online-update gcc (Debian 4.6.2-12) java version "1.6.0_24" OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b24~pre2-1) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode) Hope it helps. Julien -- View this message in context: http://nabble.documentfoundation.org/Trying-to-understand-why-LO-seems-freezed-for-some-seconds-when-a-module-is-started-tp3735600p3774132.html Sent from the Dev mailing list archive at Nabble.com.