[Koha] Koha getting slow

[ikbar]

hi all masters

im here faced some issue when my koha installed 4 months ago getting slower.
Im tried clear memchached, restart apache and restart plack, but the
performance still slow even when i go to intra login page its slow, after
login page to intra page also slow and clicking to each module in koha same
performance...its too SLOW. not like before. Here some details about my koha
:

Server information
Koha version:	18.05.10.000
OS version ('uname -a'):	Linux kohaweb 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2
(2018-10-27) x86_64
Perl interpreter:	/usr/bin/perl
Perl version:	5.024001
Perl @INC:	/usr/share/koha/lib 
/usr/share/koha/installer 
/usr/share/koha/lib/installer 
/etc/perl 
/usr/local/lib/x86_64-linux-gnu/perl/5.24.1 
/usr/local/share/perl/5.24.1 
/usr/lib/x86_64-linux-gnu/perl5/5.24 
/usr/share/perl5 
/usr/lib/x86_64-linux-gnu/perl/5.24 
/usr/share/perl/5.24 
/usr/local/lib/site_perl 
/usr/lib/x86_64-linux-gnu/perl-base 
/var/lib/koha/kplh/plugins 
/var/lib/koha/kplh/plugins 
MySQL version:	mysql Ver 15.1 Distrib 10.1.37-MariaDB, for debian-linux-gnu
(x86_64) using readline 5.2
Apache version:	Server version: Apache/2.4.25 (Debian)
PSGI:	Plack (deployment)
Memcached:	Servers: 127.0.0.1:11211 | Namespace: koha_kplh | Status:
running. | Config read from: koha-conf.xml
Zebra version:	Zebra 2.0.59 (C) 1994-2014, Index Data Zebra is free
software, covered by the GNU General Public License, and you are welcome to
change it and/or distribute copies of it under certain conditions. SHA1 ID:
c00bfddbf0f3608340d61298acc61dafb167f9b2 Using ICU
Date and time:	03/07/2019 04:08 AM
Time zone:	Used: Asia/Kuala_Lumpur | Config: Undefined | Environment (TZ):
Undefined

And my server requirement is running in VM where RAM is 32GB, 16vCPUs
Im stuck.... please help me to solve this issue.... thanks for advance



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