replicating very high cpu usage when not doing any calculation at all

node_irrational_highCPU

var  data           = []
    ,number         = 5000
    ,numberElements = 130
    ,numberQueries  = 15;


for( var i = 0; i < number; i++ ) {
    data[ i ] = {};
    for( var x = 0; x < numberElements; x++ ) {
        data[ i ][ createRandomString( 10 ) ] = createRandomString( 20 );
    }
}

console.log( 'finished' );

process.stdin.resume();
process.stdin.on( 'data', query );

function query( ) {
    var  result = []
        ,start = new Date().getTime();
    for ( var i = 0; i < data.length; i++ ) {
        for( var numberQuery = 0; numberQuery < numberQueries; numberQuery++ ) {
            var str = createRandomString( 10 );
            if ( data[ i ][ str ] ) {
                result.push( str );
            }
        }
    }
    console.log( new Date().getTime() - start );
    console.log( result );
}

function createRandomString( length ) {
    var res = '';
    var src = 'abcdefghijklmnopqrstuvwxyz01234567890';
    for( var i = 0; i < length; i++ ) {
        res += src.charAt( Math.floor( Math.random() * src.length ) );
    }
    return res;
}