problem with the NO$GBA....

I'm trying to play Pokemon Diamond and Pearl... but it is really laggy.... any way to fix this problem ?

Go to Options, then Emulation Setup, and change the settings around such as the sound to the one with (fast) etc. It also depends on how fast your computer is and your RAM. If you have a 1.5 ghz or something similar or more, and at least 512 MB of RAM, you shouldn't have a problem. For anything more, go to this tutorial https://www.romulation.org/forum/index.php/topic,6485.0.html or you can always use the settings on this thread. https://www.romulation.org/forum/index.php/topic,4568.0.html :)