Compared to Qbittorrent the download speed is very slow

[xDreamms]

What can I do to make it same download speeds with QBittorrent or is there any torrent download client fast as QBittorent?

My settings:

private ClientEngine InitClientEngine()
{
    int DefaultPort = 55123;

    var settingBuilder = new EngineSettingsBuilder
    {
        MaximumConnections = 5000,
        MaximumOpenFiles = 500,
        MaximumUploadRate = 0,
        MaximumDownloadRate = 0,
        MaximumDiskReadRate = 0,
        MaximumDiskWriteRate = 0,
        MaximumHalfOpenConnections = 12,
        AllowPortForwarding = true,

        AutoSaveLoadDhtCache = true,

        AutoSaveLoadFastResume = true,

        AutoSaveLoadMagnetLinkMetadata = true,

        ListenEndPoints = new Dictionary<string, IPEndPoint> {
            { "ipv4", new IPEndPoint (IPAddress.Any, DefaultPort) },
            { "ipv6", new IPEndPoint (IPAddress.IPv6Any, DefaultPort) }
        },

        DhtEndPoint = new IPEndPoint(IPAddress.Any, DefaultPort),
    }.ToSettings();

    return new ClientEngine(settingBuilder);
}

private TorrentSettings GetTorrentSettings()
{
    return new TorrentSettingsBuilder
    {
        MaximumConnections = 5000,
        UploadSlots = 200,
        MaximumUploadRate = 0,
        MaximumDownloadRate = 0
    }.ToSettings();
}