I was wondering why the file was 5 fukin MBs. Moskvich, why is there an ALPHA CHANNEL??? Remove the ALPHA channel ffs, then it will only be 2.6MB, and you can rar it and upload it to the forum. Remember, the larger the file is the more video memory it will take up. What do you think? 5MB vs 2.6 MB for each XFG if you have a full grid? How much is that, like 160MB vs 83 MB.
You're right unseen, I don't know what I was thinking, I was talking gibberish last night.
Anyway, after removing the alpha layer I saved the file and it was only 2.6 MB at 2048x2048, make sure you save without alpha layer, I think it's the DXT1 setting, the first one.