F-Zero GX, lagging badly?

[RaptorZX3]

i always run the latest revision of Dolphin (64-bit version on my PC, and so many peoples are saying F-Zero GX run great on it...

I got the game now and it often lag like hell during gameplay, for example, at the title screen (while there's a demo of AIs racing together) it lag a lot, framerate often dropping below 50%.

Here's my quick PC specs:
Microsoft Windows 7 Home Premium 64-bit
Intel Core i5 750 @ 2.73 Ghz
G.Skill 4 x 2gb DDR3-1600
eVGA Geforce GTS 250 512mb
Western Digital WD10EALS 1Tb Blue drive
Creative Sound Blaster X-Fi XtremeGamer PCI

i don't think my PC is the problem, maybe the emulation isn't perfect?

in DirectX9 settings, here's what i have:


None are enabled in Advanced.

If it's possible...what should i do to make it run smoothly?

[skid]

Either use the r6571 revision or wait. The lag is caused by the WIP FIFO code.

[RaptorZX3]

i see the r6571 is still buggy sometimes (it crashed at the title screen while i was doing something else (saying something about the GPU de-sync), but generally-speaking, the gameplay is smooth and more regular than the newer builds.

But the FIFO is supposed to be faster than the previous builds, when it's fully optimized?

[skid]

Yes, but it's not ready yet.