Macbook Pro 2020 13" and bad image quality with external VGA monitor

I have just bought a new MBP 2020 13" and at the moment I am using it with an old 17" HP L1750 external monitor with the USB-C-to-VGA apple adapter; the quality of o the image on the external monitor is way worst than the one I got with my old MBP 13" 2009 (also with VGA adaptor): the text is kind of blurry and reading on that monitor is very tiring for the eyes. Do you know why and if there is a solution? In both cases the external monitor is set (in MacOS preferences) to 1280x1024, the native monitor resolution. Thanks.