9999x9999 map saving crash

I have a space map I'd like to make that's 9999x9999. When I import the background then try to save my browser crashes. I don't blame it it's a big map. But does anyone know any possible fixes?

You probably don't have enough RAM memory to process such a large image. Try closing all other apps & browser tabs, or use a different browser.

Yeah i tried uploading a 18MB 9999x8700 or something and it crashed my browser lmao.

The Middle Earth map crashes by browser. :/

I thought you couldn't make maps larger than 10,000 x 10,000. I have 2.00 GB (1.60 GB Free) of RAM (rating 2.5) and 9000x8000 maps don't crash when I save. But the only map that crashes on any size for me is the Middle Earth map. My processor is also slow, 1.5GHz AMD (so no 2nd/3rd Gen i5 or i7 power boost technology )