very slowly apps

[swiety]

I have problem with QProcess. My code:

class Mencoder : public QObject
{
...
private:
 QProcess *proc;
};
..
 
Mencoder::Mencoder( .../* some parameters */, QObject *parent ) : QObject( parent )
{
 proc = new QProcess( this );
 connect( proc, SIGNAL( readyReadStandardOutput() ), this, SLOT( update() ) );
 connect( proc, SIGNAL( finished(..) ), this, SLOT( on_finished(..) ) );
 QStringList arg;
 ...
 proc->start( "mencoder", arg );
}
 
void Mencoder::update()
{
 ......
 emit newInfo( .... /*some new data for main apps*/  );
}
 
void Mencoder::on_finished(..)
{
 ..
 proc->close();
 deleteLater();
}

class Mencoder : public QObject
{
...
private:
 QProcess *proc;
};
..

Mencoder::Mencoder( .../* some parameters */, QObject *parent ) : QObject( parent )
{
 proc = new QProcess( this );
 connect( proc, SIGNAL( readyReadStandardOutput() ), this, SLOT( update() ) );
 connect( proc, SIGNAL( finished(..) ), this, SLOT( on_finished(..) ) );
 QStringList arg;
 ...
 proc->start( "mencoder", arg );
}

void Mencoder::update()
{
 ......
 emit newInfo( .... /*some new data for main apps*/  );
}

void Mencoder::on_finished(..)
{
 ..
 proc->close();
 deleteLater();
}

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Everything works, but i have problem with cpu usage. From system info i have this:

%CPU COMMAND
32 mencoder
40 myApps
23 xorg

Wher's the problem?