FCE Ultra GX performance

I've recently softmodded my 4.3 Wii using the Softmod Any Wii guide and I've installed FCE Ultra GX 3.3.1. I've tried this from both a forwarder channel and direct from the HBC and have noticed significant performance issues. For example in Mega Man 1 there is slowdown anytime I fire 3 shots and have 2 or more enemies on the screen. Likewise in Metroid Samus becomes invisible when taking damage. Are these issues to be expected or have I done something wrong? I have turned off filtering in the video settings but I haven't noticed any performance improvement.

Sorry mods, realised this should be in the Emulators section - please move.