My problem is usage of CPU, my clients open files dbf and ntx.

last pid: 66441;  load averages:  4.44,  3.78,  3.43                                                        up 6+17:28:10  11:37:35
164 processes: 3 running, 161 sleeping
CPU states:     % user,     % nice,     % system,     % interrupt,     % idle
Mem: 197M Active, 1474M Inact, 241M Wired, 94M Cache, 199M Buf, 3004K Free
Swap: 2048M Total, 412K Used, 2047M Free

  PID USERNAME      PRI NICE  SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
86773 root           64   0 10324K  4856K RUN    0  14:33 41.06% 41.06% smbd
86403 root           18   0 10072K  4772K lockf  0   9:36 40.19% 40.19% smbd
79160 root           18   0 10516K  5408K lockf  0  81:52 38.38% 38.38% smbd
86588 nobody          2   0 10048K  5116K poll   1  28:47 24.46% 24.46% smbd
80544 nobody         64   0 10320K  6008K CPU1   0   8:11 19.78% 19.78% smbd
86691 nobody          2   0 10284K  5308K poll   1   4:04  4.20%  4.20% smbd
87018 nobody          2   0 18136K 12640K poll   0   6:01  2.83%  2.83% smbd
86649 acreditacao     2   0 10412K  5592K poll   1   1:23  1.66%  1.66% smbd
86841 financeiro      2   0 10348K  5832K poll   0   0:22  1.61%  1.61% smbd
86659 root           18   0 10232K  4760K lockf  0  11:02  1.56%  1.56% smbd
86575 root            2   0 10408K  5376K poll   1  11:29  1.46%  1.46% smbd
88465 internacao      2   0 10592K  5952K poll   0   1:35  1.27%  1.27% smbd
86720 root            2   0 10312K  5160K poll   1  17:53  1.17%  1.17% smbd

Thanks