ionic 4 ZBar scanner performance issues

I am using native ZBar plugin for ionic 4 because of better performance over ionic native barcode scanner. Zbar scanner scan does not always scan the barcode correctly. I want to make it reliable and want it to perform better. from ionic I can give only these options

{
    text_title: "OPTIONAL Title Text - default = 'Scan QR Code'", // Android only
    text_instructions: "OPTIONAL Instruction Text - default = 'Please point your camera at the QR code.'", // Android only
    camera: "front" || "back" // defaults to "back"
    flash: "on" || "off" || "auto" // defaults to "auto". See Quirks
    drawSight: true || false //defaults to true, create a red sight/line in the center of the scanner view.
}

how can I make it better?

from ionic 4 ZBar scanner performance issues