affects me too. couldn't figure out exact circumstances, except that every now and then the machine slows down, I go to top and kill the evil-thumbnailer KiB Mem: 8115116 total, 2468792 used, 5646324 free, 61856 buffers KiB Swap: 15362856 total, 68 used, 15362788 free. 1488384 cached Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2760 israel 20 0 663004 35572 27672 S 3,7 0,4 0:02.90 gnome-term+ 1507 root 20 0 357372 66992 53364 S 2,7 0,8 0:27.04 Xorg 1940 israel 20 0 667820 31668 24744 S 0,7 0,4 0:02.36 metacity 79 root 20 0 0 0 0 S 0,3 0,0 0:04.49 kworker/3:1 1614 israel 20 0 633832 24536 18876 S 0,3 0,3 0:00.55 bamfdaemon 1981 israel 20 0 846464 38048 28032 S 0,3 0,5 0:03.05 gnome-panel 4070 israel 20 0 1087984 381656 75100 S 0,3 4,7 1:23.58 firefox 4581 root 20 0 0 0 0 S 0,3 0,0 0:00.02 kworker/1:0 1 root 20 0 29652 4252 2480 S 0,0 0,1 0:02.65 init 2 root 20 0 0 0 0 S 0,0 0,0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0,0 0,0 0:00.67 ksoftirqd/0 4 root 20 0 0 0 0 S 0,0 0,0 0:20.33 kworker/0:0 5 root 0 -20 0 0 0 S 0,0 0,0 0:00.00 kworker/0:+ 7 root 20 0 0 0 0 S 0,0 0,0 0:01.14 rcu_sched 8 root 20 0 0 0 0 S 0,0 0,0 0:02.89 rcuos/0 9 root 20 0 0 0 0 S 0,0 0,0 0:01.52 rcuos/1 10 root 20 0 0 0 0 S 0,0 0,0 0:00.83 rcuos/2 israel@macbookair:~/Is/Presentations$ ps -ef|grep evince israel 5013 4990 0 20:41 pts/8 00:00:00 grep --color=auto evince israel@macbookair:~/Is/Presentations$ which evince-thumbnailer /usr/bin/evince-thumbnailer israel@macbookair:~/Is/Presentations$ man evince-thumbnailer israel@macbookair:~/Is/Presentations$ dmesg|grep thumb [ 399.777763] audit: type=1400 audit(1416347163.207:39): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=2864 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 399.779662] audit: type=1400 audit(1416347163.211:40): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=2869 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 400.510047] audit: type=1400 audit(1416347163.943:41): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=2896 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 400.511794] audit: type=1400 audit(1416347163.943:42): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=2901 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 401.280285] audit: type=1400 audit(1416347164.711:43): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=2928 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 401.282481] audit: type=1400 audit(1416347164.715:44): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=2933 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 402.046247] audit: type=1400 audit(1416347165.479:45): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=2960 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 402.048067] audit: type=1400 audit(1416347165.479:46): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=2965 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 637.213346] audit: type=1400 audit(1416347400.766:47): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=3071 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 637.216243] audit: type=1400 audit(1416347400.770:48): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=3076 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 638.624604] audit: type=1400 audit(1416347402.178:49): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=3103 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 638.627302] audit: type=1400 audit(1416347402.182:50): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=3108 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 640.007869] audit: type=1400 audit(1416347403.562:51): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=3135 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 640.010554] audit: type=1400 audit(1416347403.566:52): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=3140 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 641.329963] audit: type=1400 audit(1416347404.886:53): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexnam" pid=3168 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0 [ 641.332585] audit: type=1400 audit(1416347404.886:54): apparmor="DENIED" operation="exec" profile="/usr/bin/evince-thumbnailer//sanitized_helper" name="/usr/share/texlive/texmf-dist/web2c/mktexupd" pid=3173 comm="mktexpk" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0