Well after a 12 hours session working on this i now have what seems very close to the same speed as neo4all, I have been working on viewpoint for example and have got it to work past stage 2 just one example thats really the point to get other games working or fix bugs now i have the speed up to 95 to 100% of the real console.. Now how i judged this is by watching youtube of the same games running on real hardware while watching them running on real Dreamcast hardware on the emulator it's very close now major speed up on all games.
Games hiting 60fps
KABUKI KLASH / Tengai Makyou Shin Den / Far East Of Eden
SAMURAI SHODOWN 3 / Samurai Spirits -Zankurou Musouken
BUST A MOVE / PUZZLE BOBBLE
SOCCER BRAWL
LEAGUE BOWLING
STREET HOOP / DUNK DREAM
WORLD HEROES PERFECT
WORLD HEROES 2 JET
All other games are 80 to 100% now
features
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--Optimized z80 core now
--Optimized c68 core much faster
--Sound fixes no more sound effects hanging between loading on most games not all some still have this bug Some have been fixed
--Pvr dma render now proper screen clearing 5% speed up
-- theme able splash screen can now make mock looking ports
--Threaded cdda
-- hand tuned compiler flags for max speed
-- zero frameskip
-- Code clean up and functions Multi game play demo youtube videos showing speed up across the board
Example of a mock port with now change able splash screen

Plainfiles
Source code
Multi game play demo youtube video showing speed up across the board
Plainfiles Source code