high cpu process from a plesk process

[cpartassides]

Hello , the below multiple processes use high CPU very often. They restart when i kill them and shutdown when they want. (OMG they have their own hive mind !)

Without further ado :

top - 15:49:13 up 2 days, 10:17,  1 user,  load average: 0.55, 0.37, 0.17
Tasks:  76 total,   2 running,  74 sleeping,   0 stopped,   0 zombie
Cpu0  : 23.5%us,  6.4%sy,  0.0%ni, 70.1%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  :  5.7%us,  3.0%sy,  0.0%ni, 91.3%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   4194304k total,   907768k used,  3286536k free,        0k buffers
Swap:        0k total,        0k used,        0k free,   367436k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 8506 psaadm    20   0  454m  38m  21m S 15.6  0.9   0:30.98 sw-engine-fpm: pool plesk
 8503 psaadm    20   0  455m  38m  21m S  7.3  1.0   0:29.42 sw-engine-fpm: pool plesk
 8992 psaadm    20   0  455m  38m  20m R  7.0  0.9   0:41.87 sw-engine-fpm: pool plesk
17298 mysql     20   0 1196m  39m 6116 S  2.7  1.0   5:59.55 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run
16677 sw-cp-se  20   0 46392 3940 1764 S  1.3  0.1   0:22.50 sw-cp-server: worker process
11925 root      20   0  165m 3028 1940 S  0.0  0.1   0:00.00 CROND

I am off-course referring to the multiple : sw-engine-fpm: pool plesk commands

Can someone offer advice on what this process does and why i have so many that use so high cpu ?

Many thanks

C.