Are you sure that you're using the correct config in the DX9 plugin? :/
EFB to Texture and stuff, there are enough threads where the fastest config is mentioned already....
Off topic question, but does relate to the sound plugins ._.
I've seen on the google code page the "save to file" on the Dolphin debug mode GUI screenshots of an old version. Of course, they said they lost features with some rehaul in code, but was that a way to dump the sound to the timing of the Wii? Like how PCSX2 are able to dump sound in basically perfect timing...
If not, would there be any way to dump the sound from the plugin? Like how there's an option to dump the rendered frames for video? This would pretty much be a very big help for people who can get higher resolution recordings via the emulator than with a Dazzle for the actual console ._.
The Dsound backend seems to be having problems since a while with Audio. There is crackly sound with the Dsound backend, the sound with OpenAL doesn't crackle but it skips a lot to try staying in sync with the video.
The Dsound backend crackles a lot with both the HLE and LLE plugin while the OpenAL backend is crystal clear.