disk io is about 1-2 MB/s, system is extremely slow:
-----------------
iotop report for a 1GB file copy (you can see the disk io is about 99% and the
write speed is about 1.4 MB/s when copying with 'cp' command:
17129 be/4 georgeg     0.00 B/s 1414.19 K/s  0.00 % 99.22 % cp
./some_big_bile.tmp /tmp

disk health is OK, hdparm report about 100MB/s:
hdparm -t /dev/sda
/dev/sda:
 Timing buffered disk reads: 334 MB in  3.01 seconds = 110.82 MB/sec

uname -a
Linux gg 4.6.2-1-pae #1 SMP PREEMPT Fri Jun 10 08:12:44 UTC 2016 (2a68ef0) i686
i686 i386 GNU/Linux

lsb_release -a
LSB Version:   
core-2.0-noarch:core-3.2-noarch:core-4.0-noarch:core-2.0-ia32:core-3.2-ia32:core-4.0-ia32:desktop-4.0-ia32:desktop-4.0-noarch:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.2-ia32:graphics-3.2-noarch:graphics-4.0-ia32:graphics-4.0-noarch
Distributor ID:    openSUSE
Description:    openSUSE Tumbleweed (20160422) (i586)
Release:    20160422
Codename:    Tumbleweed


Please advice where to look further.
Thank you,