Emulator

map requires copy to ram.

and, how do I do that?

Search through graphics settings?

Although this may fix the MAP, the FPS drops about 10 frames giving 20fps :
Is there another work around for this?

There's no other workaround, lad.

Every setting in Dolphin is a tradeoff between performance and functionality. You can't have the best of both worlds, but at the very least you have a choice.

Be sure to check the recommended configuration here.

http://wiki.dolphin-emulator.com/index.php?title=The_Legend_of_Zelda:_Twilight_Princess_(GC)
http://wiki.dolphin-emulator.com/index.php?title=The_Legend_of_Zelda:_Twilight_Princess_(Wii)

In my testing, I had that problem with the map when using directx11 or opengl. To correct this problem, I activated EFB Copy to ram and moved the texture cache accurcy. However, I did not have this problem with the Directx9 video renderer. You might try directx9 with dfb to texture which work correctly with the maps in my testing. Directx9 was still slower for me than the two other. Check for yourself, this is highly dependant of the graphical card.