[Koha] Performance Problems PERL

[Ricardo Becerra Gómez]

Dear All,  We are using Koha version: 3.8.6, we installed firstly koha in SUSE, we decided change to DEBIAN due performance problems, however we see high cpu consume in PL process, yet. Is normal this cpu consume? Below, I printed top linux command. 
Advance thanks. top - 14:33:09 up  6:16,  6 users,  load average: 5.32, 5.11, 3.65
Tasks: 194 total,  11 running, 181 sleeping,   0 stopped,   2 zombie
Cpu(s): 80.5%us,  5.5%sy,  0.0%ni, 13.9%id,  0.1%wa,  0.0%hi,  0.1%si,  0.0%st
Mem:     15954M total,     5481M used,    10472M free,       82M buffers
Swap:     2053M total,        0M used,     2053M free,     2447M cached   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
19878 wwwrun    20   0  203m  79m 6896 R   48  0.5   0:01.43 circulation.pl
19880 wwwrun    20   0  199m  75m 6856 R   38  0.5   0:01.13 newordersuggest
19882 wwwrun    20   0  206m  78m 7168 S   36  0.5   0:01.08 search.pl
19883 wwwrun    20   0  186m  68m 6288 R   30  0.4   0:00.89 returns.pl
19884 wwwrun    20   0  154m  50m 6128 R   21  0.3   0:00.62 circulation.pl
19887 wwwrun    20   0  127m  38m 5056 R   14  0.2   0:00.42 patronimage.pl
19885 wwwrun    20   0  126m  33m 5644 R   13  0.2   0:00.38 opac-search.pl
19886 wwwrun    20   0  127m  33m 5648 R   13  0.2   0:00.38 mainpage.pl
 9190 mysql     20   0 11.3g 2.0g 5436 S    3 13.1   2:37.01 mysqld
19888 wwwrun    20   0 47296 9060 2676 R    3  0.1   0:00.08 circulation.pl
19889 koha      20   0  335m  86m 2204 D    3  0.5   0:00.08 zebrasrv
19890 wwwrun    20   0 20480 5052 2288 R    1  0.0   0:00.03 opac-account.pl
 3101 root      20   0 46772  804  452 S    0  0.0   0:01.83 udisks-daemon
 3167 gdm       20   0  277m  18m  13m S    0  0.1   0:51.46 gdm-simple-gree