Q: I am crashing to desktop when loading/changing levels.
Q: I am getting a lot of lag on levels.
A: The most common cause of this is that you are running out of memory (though there are other causes). BF2 was a memory intensive game, and PR only increases on that.
First, you can try lowering your video settings, in particular, Textures. If that doesn't help or fix your issue, you can try increasing your virtual memory.
If that STILL doesn't work, you can try patching your bf2.exe to allow it to use more than 2GB of memory. This is only useful if you indeed do have more than 2GB of memory. Firstly, you want to backup your current bf2.exe in your "C:\Program Files\EA Games\Battlefield 2" (default install location) folder. To do this, simply rename it from bf2.exe to bf2.exe.original. You should back it up incase you have any issues in the future. Now you need to download the patched bf2.exe. This can be found in THIS zip file (THIS one if your using the EA Downloader version) (If you get a virus warning, ignore it, just a false positive). Then simply extract it next to bf2.exe.original, and your good to go.
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+fullscreen 0 +szx 1440 +szy 900