I have slowly increased the pixel width of my images as my monitors have got larger and higher in pixels. I think I started posting 1200 pixels width many years ago, increased to 2400 when I had 2560 screens and now load 3600 wide images (landscape orientation) for good viewing with a 4k screen. I will occasionally upload one that's a good bit larger if I want to enable higher mag viewing because the image deserves detail scrutiny, but probably only a handful each year. I use jpg compression of 9 or 10.