07417: thunt and clones: Performance hit in one specific fade out

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07417	Speed	Minor	Always	Sep 11, 2019, 02:35	Sep 12, 2019, 13:31

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Confirmed			Driver	sega/stv.cpp
Version	0.213	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07417: thunt and clones: Performance hit in one specific fade out
Description	There's this level in Puzzle & Action: Treasure Hunt where you drive a car through an interconnected set of roads and everything runs fine until you lose and the following fade out takes a huge hit on the performance. Despite this slowdown and a few very small graphic bugs, the whole game is now fully playable at a surprisingly great and steady speed (same game kept stuttering and randomly hanging not so many versions ago, in my laptop).
Steps To Reproduce	Just load the provided savestate where I got a Time Over and the fade out will happen in a few seconds. Or If you want to reproduce the issue by yourself, without using the savestate, you have to: - Choose the car game (car icon on it) - Lose one life
Additional Information	Also, the Japanese version is mistransliterated as "Sando-R" instead of the correct "Sand-R", which also affects the set's file name "sandor.zip", but I'm not sure if that kind of stuff is handled over here through reports or directly as pull requests.
Github Commit

Flags
Regression Version
Affected Sets / Systems	thunt and clones

Attached Files	thunt.zip (1,073,781 bytes) Sep 11, 2019, 02:35 Uploaded by ICEknight
	0001.png (23,968 bytes) Sep 12, 2019, 11:25 Uploaded by MetalGod
	0000.png (48,424 bytes) Sep 12, 2019, 11:25 Uploaded by MetalGod

No.16896 Hydreigon Tester Sep 11, 2019, 13:42 edited on: Sep 11, 2019, 13:44	There has been multiple reports of stv/saturn related slowdown issues. Although my favorite is 05188, I have a feeling it's related to 07203 since this type of (extreme) slowdown happens during a fade transition.
No.16905 MetalGod Senior Tester Sep 12, 2019, 11:14 edited on: Sep 12, 2019, 14:10	I've found out this bug has major consequences later during gameplay. After ocurring there's a probability (50%) that the game will crash in the following minutes. The situations in which the game crashes are: - When facing a new enemy (see attach). I've even have a MAME crash here with the emulator closing the game. It is more common just a screen hang. - After finishing any minigame. Hanged on black screen transition - Inside the Bruce Lee Towel minigame. Sometimes it shows a graphical bug (see attach), sometimes doesn't. Inputs will stop working while playing this game. Then after being unable to continue, the game will hang on black screen transition. If you never play the car minigame you can finish the whole game with no problems.
No.16906 MetalGod Senior Tester Sep 12, 2019, 13:31	Tested on mame 0.198, 0.194, 0.180, 0.150.... Same behaviour 0.130, there's also slowdown, but not as intense. I guess because the driver was not so cpu demanding back then This has no regression version. It's always been there.