notmuch painfully slow

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+From: Xavier Maillard <xma@gnu.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: notmuch painfully slow\r
+User-Agent: Notmuch/0.5-133-gc509598 (http://notmuchmail.org) Emacs/23.2.1\r
+       (i486-slackware-linux-gnu)\r
+Date: Fri, 22 Apr 2011 16:14:52 +0200\r
+Message-ID: <m27hamz82r.fsf@gnu.org>\r
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+\r
+Hi,\r
+\r
+as time goes, notmuch is really becoming slower and slower. It may be\r
+normal as it has more and more messages to "track" but I am not sure it\r
+is that normal give these numbers:\r
+\r
+- notmuch version: notmuch 0.5-133-gc509598\r
+- notmuch count: 18475\r
+- uname: Linux kcals 2.6.33.4-smp #2 SMP Wed May 12 22:47:36 CDT 2010\r
+         i686 Intel(R) Atom(TM) CPU N270   @ 1.60GHz GenuineIntel GNU/Linux\r
+- Load average: 0.00 0.00 0.00 1/144 28377\r
+- Memory:\r
+             total       used       free     shared    buffers     cached\r
+Mem:           992        881        111          0        253        500\r
+-/+ buffers/cache:        127        865\r
+Swap:          506          0        505\r
+\r
+This is on a Slackware GNU/linux system on a Eee PC 901 (thus SSD\r
+storage). I am using my computer *exclusively* in the virtual linux\r
+console (tty) and 99% of my tasks are done through GNU Emacs (dunno if\r
+is of any interest for this problem though).\r
+\r
+My sync script is taking really long time to achieve, updating one mail\r
+at a time is also really slow (several seconds). In the worst cases,\r
+updating my collection can take upto 15 minutes and updating just one\r
+message can take up to the minute too !\r
+\r
+What is happening here ? Is there any maintenance task I should do onto\r
+my mail collection ?\r
+\r
+Thank you for your help.\r
+\r
+/Xavier\r