Site muito, muito, muito lento

Site muito, muito, muito lento.

Uso servidor privado, pago 30 dólares por mês

O site https://www.ignews.com.br/ ficou lento, muito lento de dezembro para cá, está tudo atualizado theme e todos os plugins. O que pode ser?

Server Status

OS Type: Linux ps594994 3.14.52-vs2.3.6.15-1 #1 SMP Wed Nov 2 10:45:38 UTC 2016 x86_64 (64 bit)
Server Software: Apache
CPU Cores: 16 Cores
Load Average: 0.08, 0.06, 0.07
IP (Hostname): 69.163.235.13 (ps594994)
Disk Space: 6,67 GB (22%) used of 30,00 GB total
Database Size: 64,35 MB
Database Name (Hostname): ignewsbackup (mysql.agenciamakeit.com.br)
MySQL Version: 5.6.34-log
Database Charset (Collate): utf8mb4 (n/a)
Document Root: /home/ignews/www.ignews.com.br
Theme Path: /home/ignews/www.ignews.com.br/wp-content/themes/Newspaper
WP Locale (Charset): pt-BR (UTF-8)
Server Timezone (WP): UTC (UTC-4)
PHP Version: 5.6.33
PHP Extensions: Core, date, ereg, libxml, pcre, sqlite3, filter, mbstring, SPL, PDO, Reflection, pdo_sqlite, hash, session, cgi-fcgi, bcmath, bz2, calendar, ctype, curl, dom, standard, ftp, gd, gettext, exif, iconv, imap, json, mcrypt, mysqlnd, mysqli, openssl, pcntl, pdo_mysql, posix, pspell, mysql, SimpleXML, soap, sockets, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib, imagick, memcached, mhash, Zend OPcache
Max Upload, Post Size (Input Vars): 1024M, 1024M (1000)
Memory Usage: 23M (2%) of 990M (actual limit)
WP Memory Limit: 890M (defined limit)
WP Admin Memory Limit: 990M (defined limit)
WP Debug: Disabled (no logging, display)
Opcache Size (Max Files, Revalidate): 64M (2000, 2 secs)
Page Cache (Plugin): Enabled
Object Cache: Disabled

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