Stop work mean that when i try to load the site with browser, I can't. It takes too long to respond.

Type of site: Dynamic content with a database behind it.
Database: Mysql
Webserver: Apache

When i run command:
Code:
top
i receive this:
top - 15:52:05 up 11:21, 1 user, load average: 9.16, 6.43, 5.89
Code:
Tasks: 195 total,   8 running, 187 sleeping,   0 stopped,   0 zombie
Cpu(s): 89.8%us,  9.2%sy,  0.0%ni,  0.3%id,  0.0%wa,  0.0%hi,  0.7%si,  0.0%st
Mem:   8161688k total,  7344168k used,   817520k free,   117612k buffers
Swap:  8370172k total,        0k used,  8370172k free,  6308200k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  515 mysql     20   0 2464m 105m 7444 S  174  1.3  16:16.88 mysqld
13888 www-data  20   0  161m  31m 5472 R   99  0.4 377:15.31 ffmpeg
12936 www-data  20   0  153m  23m 5040 R   98  0.3 399:06.39 ffmpeg
 1910 www-data  20   0  152m  21m 5228 R   60  0.3   0:04.11 ffmpeg
 1828 www-data  20   0  166m  38m 5772 R   47  0.5   1:13.89 ffmpeg
 1909 www-data  20   0  133m 6592 4496 R   39  0.1   0:03.21 ffmpeg
 1836 www-data  20   0  158m  26m 5264 R   37  0.3   1:04.56 ffmpeg
 1603 www-data  20   0  134m 8372 4904 S   32  0.1   0:39.91 ffmpeg
 1898 www-data  20   0  134m 8004 4896 S   11  0.1   0:02.67 ffmpeg
  741 www-data  20   0  471m  13m 4388 S    0  0.2   0:00.06 apache2
  794 root      20   0     0    0    0 S    0  0.0   0:00.13 kworker/1:1
 1892 www-data  20   0  469m  14m 4308 S    0  0.2   0:00.03 apache2
 1923 www-data  20   0  471m  13m 4232 S    0  0.2   0:00.01 apache2
 1924 www-data  20   0  470m  13m 3852 S    0  0.2   0:00.01 apache2
    1 root      20   0 24440 2424 1356 S    0  0.0   0:01.22 init
    2 root      20   0     0    0    0 S    0  0.0   0:00.00 kthreadd
    3 root      20   0     0    0    0 S    0  0.0   0:00.44 ksoftirqd/0
No erros in mysql error log.
In apache log there are only information about ffmpeg converstion.