Yeah saw your wiki post after trying the find my own way tech demo, thought nobody wouldve tested it and actually reported it but there it was and quit recently aswell
Anyway i have found the problem with the log, its not performance related i think. Here is a fraction of the log:
(EE pc:00107AB0) TLB Miss, addr=0x70004b70 [load]
(EE pc:001079A4) TLB Miss, addr=0x70004b80 [store]
(EE pc:001079A4) TLB Miss, addr=0x70004b90 [store]
(EE pc:00107AB0) TLB Miss, addr=0x70004b80 [load]
(EE pc:00107AB0) TLB Miss, addr=0x70004b90 [load]
(EE pc:001079A4) TLB Miss, addr=0x70004ba0 [store]
(EE pc:001079A4) TLB Miss, addr=0x70004bb0 [store]
Find my own way demo starts to play, but seems to be 1fps or something with only showing half the demo, same for the song/sound.
It just 'spams' this the whole time, only that nothing else. I assume its not a performance porblem? Or is it cause of high fillrate between GS and VRAM? Anyhow maybe the devs see something in this. Have tried with the real disc aswell as with a copy, hardware mode, software mode, speedhacks on/off, no difference, same errors in PCSX2 log. On the actual real PS2 (3004R), disc plays fine, but converting it to an iso and reading it from the HDD doesnt work, openps2loader just doesnt see the iso, if that helps anything.
Thought id notice, other demos/games on the demo disc work just flawless.
Edit:
Upon testing, when disabling the framelimiter in GS tab, the above errors dont appear, but the same problem persists. Though i succeeded in pausing the demo and panning around, all buatifull particles seemed there.