Updating an Image at least 30 times per second

[tmshader]

I'm trying to create an app that receives data from somewhere (from where is not important right now) 30 times per second. I want to turn that data into an image, but the data it recieves is not png or something like that, it's all of the pixels individually. How could I update that image, pixel by pixel, 30 times a second? Or what else should I use to achieve that?

Currently I create a QImage which is in Indexed8 mode and fill it up with the pixels then I convert it to a QPixmap and assign that to a QLabel

With this I can update the image every 5-6 seconds, so it's too slow.