What wrong with my LibreNMS?

My webui loading something like 15 seconds. When I watch htop, I saw this:
https://imgur.com/wLpNQJc
Is it normal?
I got about ~200 devices.

Your image is just a blur. What is your hardware?

8 cores(2 socket, 4 cores)
21 gb ram
sas 80 gb

Please c&p the output of htop or top as text.

Did you walk through the performance tips
On https://docs.librenms.org/#Support/Performance/
?

top - 18:28:22 up 4 days,  4:19,  1 user,  load average: 5.43, 5.59, 5.65
Tasks: 513 total,   6 running, 507 sleeping,   0 stopped,   0 zombie
%Cpu(s): 51.9 us, 13.3 sy,  0.0 ni, 32.9 id,  0.2 wa,  0.0 hi,  1.7 si,  0.0 st
KiB Mem : 22092376 total,   383736 free,  8653360 used, 13055280 buff/cache
KiB Swap:  1044476 total,  1043088 free,     1388 used. 12430600 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 2220 www-data  20   0  368660  33612  21700 S  81.0  0.2   2385:29 php-fpm7.0
 4061 www-data  20   0  368576  33580  21724 S  29.0  0.2   3191:38 php-fpm7.0
 2116 www-data  20   0  368572  33668  21816 R  27.5  0.2   2386:42 php-fpm7.0
10377 www-data  20   0  368572  33320  21472 S  25.0  0.2   2888:44 php-fpm7.0
26000 www-data  20   0  368632  33784  21896 S  25.0  0.2   3335:09 php-fpm7.0
 1741 mysql     20   0  815024 267660  15388 S  15.0  1.2 639:14.64 mysqld
29238 librenms  20   0 1662560 686024   2848 S  12.0  3.1 235:21.52 rrdcached
29553 www-data  20   0  125752  13164   9600 R   3.0  0.1   0:00.06 rrdtool
 1574 www-data  20   0  131316   6144   3200 S   2.0  0.0  12:09.99 nginx
29563 www-data  20   0  125372  12392   9336 R   2.0  0.1   0:00.04 rrdtool
29236 roma      20   0   42244   4140   3104 R   1.5  0.0   0:00.06 top
29565 www-data  20   0  125320  12204   9156 R   1.5  0.1   0:00.03 rrdtool
    7 root      20   0       0      0      0 S   0.5  0.0  15:26.44 rcu_sched
   23 root      20   0       0      0      0 S   0.5  0.0  20:14.50 ksoftirqd/3
   43 root      20   0       0      0      0 S   0.5  0.0  16:36.14 ksoftirqd/7
  948 root      20   0  270540  73196   6892 S   0.5  0.3   0:16.36 ruby
 1533 root      20   0  274428  76868   7348 S   0.5  0.3   0:08.30 ruby
 6034 root      20   0  274768  76372   7348 S   0.5  0.3   0:03.25 ruby
 6801 root      20   0  205552  44932   6980 S   0.5  0.2   0:00.92 ruby
 6831 root      20   0  227724  51152   7352 S   0.5  0.2   0:01.05 ruby
 8494 root      20   0  273960  75996   6956 S   0.5  0.3   0:18.96 ruby
 8615 root      20   0  274696  77224   7316 S   0.5  0.3   0:03.68 ruby
11497 root      20   0  261784  69576   7376 S   0.5  0.3   0:01.42 ruby
12303 root      20   0  274824  75772   7372 S   0.5  0.3   0:03.92 ruby
13809 root      20   0  270740  73244   6932 S   0.5  0.3   0:09.14 ruby
14057 root      20   0  270120  73280   6772 S   0.5  0.3   0:13.81 ruby
15970 root      20   0  273992  76124   6956 S   0.5  0.3   0:14.52 ruby
16477 root      20   0  274212  76724   6960 S   0.5  0.3   0:09.29 ruby
18893 root      20   0  274548  74452   7156 S   0.5  0.3   0:01.83 ruby
20489 root      20   0  273372  76368   6892 S   0.5  0.3   0:17.48 ruby
21019 root      20   0  274292  75056   7360 S   0.5  0.3   0:01.96 ruby
22004 root      20   0  270004  73388   7152 S   0.5  0.3   0:07.23 ruby
23274 root      20   0  274504  76224   7224 S   0.5  0.3   0:07.37 ruby
23969 root      20   0  274060  76256   6976 S   0.5  0.3   0:04.96 ruby
24426 root      20   0  270836  73960   6804 S   0.5  0.3   0:19.25 ruby
24837 root      20   0       0      0      0 S   0.5  0.0   0:00.25 kworker/u16:0
24954 root      20   0  273756  76036   7356 S   0.5  0.3   0:07.76 ruby
26598 root      20   0  270484  73440   6936 S   0.5  0.3   0:13.93 ruby
26814 root      20   0  272668  77168   7344 S   0.5  0.3   0:05.08 ruby
29298 root      20   0  268900  73796   7380 S   0.5  0.3   0:02.66 ruby
29569 www-data  20   0  122680   9480   8352 R   0.5  0.0   0:00.01 rrdtool
32337 root      20   0  271136  73804   6772 S   0.5  0.3   0:18.49 ruby
    1 root      20   0   37828   5772   3900 S   0.0  0.0   0:18.25 systemd
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.04 kthreadd
    3 root      20   0       0      0      0 S   0.0  0.0  23:26.01 ksoftirqd/0
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh
    9 root      rt   0       0      0      0 S   0.0  0.0   0:31.02 migration/0
   10 root      rt   0       0      0      0 S   0.0  0.0   0:00.86 watchdog/0
   11 root      rt   0       0      0      0 S   0.0  0.0   0:00.84 watchdog/1
   12 root      rt   0       0      0      0 S   0.0  0.0   0:32.59 migration/1
   13 root      20   0       0      0      0 S   0.0  0.0  21:21.88 ksoftirqd/1
   15 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/1:0H
   16 root      rt   0       0      0      0 S   0.0  0.0   0:00.84 watchdog/2
   17 root      rt   0       0      0      0 S   0.0  0.0   0:32.95 migration/2
   18 root      20   0       0      0      0 S   0.0  0.0  20:39.40 ksoftirqd/2

htop

29239 librenms   20   0 1615M  670M  2848 S  0.0  3.1  0:00.00 /usr/bin/rrdcached -B -F -R -w 1800 -z 1800 -t 4 -b /opt/librenms/rrd/ -j /var/lib/rrdcached/journal/ -G librenms -U librenms -p /run/rrdcached.pid -s librenms -l unix:/run/r
29240 librenms   20   0 1615M  670M  2848 S  0.0  3.1  0:29.01 /usr/bin/rrdcached -B -F -R -w 1800 -z 1800 -t 4 -b /opt/librenms/rrd/ -j /var/lib/rrdcached/journal/ -G librenms -U librenms -p /run/rrdcached.pid -s librenms -l unix:/run/r
29241 librenms   20   0 1617M  670M  2848 S  0.0  3.1  0:28.86 /usr/bin/rrdcached -B -F -R -w 1800 -z 1800 -t 4 -b /opt/librenms/rrd/ -j /var/lib/rrdcached/journal/ -G librenms -U librenms -p /run/rrdcached.pid -s librenms -l unix:/run/r
29242 librenms   20   0 1617M  670M  2848 S  0.0  3.1  0:28.85 /usr/bin/rrdcached -B -F -R -w 1800 -z 1800 -t 4 -b /opt/librenms/rrd/ -j /var/lib/rrdcached/journal/ -G librenms -U librenms -p /run/rrdcached.pid -s librenms -l unix:/run/r
29243 librenms   20   0 1615M  670M  2848 S  0.0  3.1  0:28.88 /usr/bin/rrdcached -B -F -R -w 1800 -z 1800 -t 4 -b /opt/librenms/rrd/ -j /var/lib/rrdcached/journal/ -G librenms -U librenms -p /run/rrdcached.pid -s librenms -l unix:/run/r
29244 librenms   20   0 1615M  670M  2848 S  0.0  3.1  0:00.05 /usr/bin/rrdcached -B -F -R -w 1800 -z 1800 -t 4 -b /opt/librenms/rrd/ -j /var/lib/rrdcached/journal/ -G librenms -U librenms -p /run/rrdcached.pid -s librenms -l unix:/run/r
29238 librenms   20   0 1615M  670M  2848 S  8.6  3.1  3h55:30 /usr/bin/rrdcached -B -F -R -w 1800 -z 1800 -t 4 -b /opt/librenms/rrd/ -j /var/lib/rrdcached/journal/ -G librenms -U librenms -p /run/rrdcached.pid -s librenms -l unix:/run/r
 1750 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:01.14 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1751 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:32.67 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1752 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:49.84 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1753 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:33.51 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1754 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:33.64 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1755 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:34.19 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1756 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:34.10 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1757 mysql      20   0  795M  260M 15388 S  0.5  1.2  1:01.63 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1758 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:47.46 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1759 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:42.21 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1760 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:46.84 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1761 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:03.60 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1784 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:17.97 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1785 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:28.55 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1786 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:32.64 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1787 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:05.43 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1788 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:03.83 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1789 mysql      20   0  795M  260M 15388 S  0.0  1.2  3:19.44 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1790 mysql      20   0  795M  260M 15388 S  0.5  1.2  6:38.40 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1791 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:17.25 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1794 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:00.00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1797 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:00.00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1799 mysql      20   0  795M  260M 15388 S  0.0  1.2  1:02.86 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
17173 mysql      20   0  795M  260M 15388 S  1.8  1.2  1h08:24 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 8570 mysql      20   0  795M  260M 15388 S  0.0  1.2  1h05:24 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 6062 mysql      20   0  795M  260M 15388 S  2.3  1.2 58:30.20 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
11603 mysql      20   0  795M  260M 15388 S  0.9  1.2 48:47.11 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
12527 mysql      20   0  795M  260M 15388 S  1.8  1.2 48:50.61 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
11619 mysql      20   0  795M  260M 15388 S  0.5  1.2  0:04.19 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
10191 mysql      20   0  795M  260M 15388 S  0.5  1.2  0:03.26 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
10193 mysql      20   0  795M  260M 15388 S  0.5  1.2  0:02.97 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 6941 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:02.11 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 6951 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:02.28 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 6971 mysql      20   0  795M  260M 15388 S  0.9  1.2  0:02.28 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 6873 mysql      20   0  795M  260M 15388 S  0.0  1.2  0:01.09 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 6895 mysql      20   0  795M  260M 15388 S  0.9  1.2  0:01.21 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 6905 mysql      20   0  795M  260M 15388 S  0.5  1.2  0:01.27 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
 1741 mysql      20   0  795M  260M 15388 S 12.2  1.2 10h39:26 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/
16580 root       20   0  275M 84292  6888 S  0.0  0.4  0:00.11 /usr/bin/ruby /opt/librenms/rrd/graphs/graphs_generator_day.rb
16572 root       20   0  275M 84292  6888 S  0.0  0.4  0:20.34 /usr/bin/ruby /opt/librenms/rrd/graphs/graphs_generator_day.rb
13280 root       20   0  267M 77676  7380 S  0.0  0.4  0:00.01 /usr/bin/ruby /opt/librenms/rrd/graphs/graphs_generator_day.rb
13276 root       20   0  267M 77676  7380 S  0.5  0.4  0:03.96 /usr/bin/ruby /opt/librenms/rrd/graphs/graphs_generator_day.rb
32697 root       20   0  268M 77384  7400 S  0.0  0.4  0:00.02 /usr/bin/ruby /opt/librenms/rrd/graphs/graphs_generator_day.rb
32692 root       20   0  268M 77384  7400 S  0.0  0.4  0:05.53 /usr/bin/ruby /opt/librenms/rrd/graphs/graphs_generator_day.rb
25863 root       20   0  268M 77376  6936 S  0.0  0.4  0:00.10 /usr/bin/ruby /opt/librenms/rrd/graphs/graphs_generator_day.rb

Yes, I walk through the performance tips.

Hm,

mine looks like followed

top - 17:50:19 up 4 days,  7:33,  1 user,  load average: 1,59, 0,85, 0,80
Tasks: 236 total,   1 running, 235 sleeping,   0 stopped,   0 zombie
%Cpu(s): 37,2 us,  5,6 sy,  0,0 ni, 53,2 id,  3,9 wa,  0,0 hi,  0,0 si,  0,0 st
KiB Mem :  8009192 total,   590328 free,   807956 used,  6610908 buff/cache
KiB Swap:  8257532 total,  8253684 free,     3848 used.  6564888 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 1586 mysql     20   0 3297952 331364  10148 S 264,5  4,1   3318:26 mysqld
16870 librenms  20   0  453204  21380  10468 S   1,7  0,3   0:00.17 php
16878 librenms  20   0  453204  21252  10468 S   1,3  0,3   0:00.17 php
  804 root      20   0  299072   6372   4972 S   0,3  0,1   3:12.28 vmtoolsd
 1589 root      20   0 1936120   5376    912 S   0,3  0,1   3:50.61 rrdcached
17132 root      20   0  162096   2440   1580 R   0,3  0,0   0:00.02 top
1 root      20   0  191396   4324   2608 S   0,0  0,1   1:22.39 systemd
2 root      20   0       0      0      0 S   0,0  0,0   0:00.13 kthreadd
3 root      20   0       0      0      0 S   0,0  0,0   0:10.20 ksoftirqd/0
5 root       0 -20       0      0      0 S   0,0  0,0   0:00.00 kworker/0:0H
7 root      rt   0       0      0      0 S   0,0  0,0   0:05.45 migration/0
8 root      20   0       0      0      0 S   0,0  0,0   0:00.00 rcu_bh
9 root      20   0       0      0      0 S   0,0  0,0   0:59.11 rcu_sched
   10 root       0 -20       0      0      0 S   0,0  0,0   0:00.00 lru-add-drain
   11 root      rt   0       0      0      0 S   0,0  0,0   0:01.69 watchdog/0
   12 root      rt   0       0      0      0 S   0,0  0,0   0:01.30 watchdog/1
   13 root      rt   0       0      0      0 S   0,0  0,0   0:06.94 migration/1
   14 root      20   0       0      0      0 S   0,0  0,0   0:12.54 ksoftirqd/1
   16 root       0 -20       0      0      0 S   0,0  0,0   0:00.00 kworker/1:0H
   17 root      rt   0       0      0      0 S   0,0  0,0   0:01.04 watchdog/2
   18 root      rt   0       0      0      0 S   0,0  0,0   0:08.44 migration/2
   19 root      20   0       0      0      0 S   0,0  0,0   0:10.70 ksoftirqd/2
   21 root       0 -20       0      0      0 S   0,0  0,0   0:00.00 kworker/2:0H
   22 root      rt   0       0      0      0 S   0,0  0,0   0:01.72 watchdog/3
   23 root      rt   0       0      0      0 S   0,0  0,0   0:06.74 migration/3
   24 root      20   0       0      0      0 S   0,0  0,0   0:10.94 ksoftirqd/3
   26 root       0 -20       0      0      0 S   0,0  0,0   0:00.00 kworker/3:0H

Similar hardware.

But for me there are a lot of php-fpm and ruby processes running.
What about the disk I/O?

Is it a VM?

Yes, vm in a proxmox ve.

php-fpm is for your website, what is going on? Are you running daily.sh? Perhaps one of your tables has grown to massive size if you aren’t doing daily maintenance.

Yes, I run daily.sh, here is my cron:

33  */6   * * *   librenms    /opt/librenms/discovery.php -h all >> /dev/null 2>&1
*/5  *    * * *   librenms    /opt/librenms/discovery.php -h new >> /dev/null 2>&1
*/5  *    * * *   librenms    /opt/librenms/cronic /opt/librenms/poller-wrapper.py 8
15   0    * * *   librenms    /opt/librenms/daily.sh >> /dev/null 2>&1
*    *    * * *   librenms    /opt/librenms/alerts.php >> /dev/null 2>&1
*/5  *    * * * librenms /opt/librenms/poll-billing.php >> /dev/null 2>&1
01   *    * * * librenms /opt/librenms/billing-calculate.php >> /dev/null 2>&1
*/5  *    * * * librenms /opt/librenms/check-services.php >> /dev/null 2>&1

@murrant but is it normal that there are that many processes of php-fpm?

Abs the load?!

Run ./validate.php and pastebin the output (fix anything is reports)

====================================
Component | Version
--------- | -------
LibreNMS  | 1.40-38-ge151aa9
DB Schema | 252
PHP       | 7.0.30-0ubuntu0.16.04.1
MySQL     | 10.0.34-MariaDB-0ubuntu0.16.04.1
RRDTool   | 1.5.5
SNMP      | NET-SNMP 5.7.3
====================================

[OK]    Composer Version: 1.6.5
[OK]    Dependencies up-to-date.
[OK]    Database connection successful
[OK]    Database schema correct

I think, the I/o that proxmox shows on this vm is very hight:

Maybe try going through the performance doc.

Ok, will try it again, maybe I do something wrong first time.