07203: batmanfr: Extreme slowdown when starting stage after Monarch Bat

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07203	Crash/Freeze	Critical (emulation)	Always	Jan 11, 2019, 02:35	Aug 23, 2019, 16:05

Tester	Planestate	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Confirmed			Driver	sega/stv.cpp
Version	0.205	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07203: batmanfr: Extreme slowdown when starting stage after Monarch Bat
Description	Issue caught by LORDBBH https://www.twitch.tv/videos/362007072?t=00h39m20s It's a regression, but not clear when it started happening.
Steps To Reproduce
Additional Information	Save State added for use with 0.205 and Git as of this writing (mame0205-341-gb999de69a5) - slot Q DRC does not appear to be an issue.
Github Commit

Flags
Regression Version	0.198
Affected Sets / Systems	batmanfr

Attached Files	q.7z (992,832 bytes) Jan 11, 2019, 10:14 Uploaded by Tafoid Save State for MAME 0,.205/Git just before slowdown

No.16025 Hydreigon Tester Jan 11, 2019, 14:33 edited on: Jan 11, 2019, 17:23	There have been a few reports of slowdown related issues on these ST-V games. Most notable examples are 05188 and 06149 .
No.16026 Tafoid Administrator Jan 11, 2019, 17:23	Hydreigon, these other bugs you mention reporting slowdown are most likely unrelated to this particular issue since this appears to be a recent regression. Have you tried the save state I made before commenting? That isn't normal render related slowdown and shouldn't be confused as such. We are talking like 1 frame per 2-3 seconds type of slowdown!
No.16040 Haze Senior Tester Jan 16, 2019, 13:44 edited on: Jan 16, 2019, 13:45	is this another one that's down to cam900? I know he made some STV mods.. there have been other performance regressions tho, ideally STV needs rewriting, or maybe modifying to use the mednafen code as the code in MAME is from a time when the platform really wasn't well understood.
No.16782 MetalGod Senior Tester Aug 23, 2019, 12:56 edited on: Aug 23, 2019, 16:04	After some long testing I can confirm regression version is 0.198 stv.cpp - 0.198: Disable ROZ optimization if mode is either 2 or 3, fixes at least (MESS) 'Bulk Slash' and 'Death Crimson' ROZ layer bugs. ROZ fixes for Radiant SilverGun Xiga stage. Support for line windows and undocumented behaviour: Rotation parameter read control seems to mirror/have a correlation in the subsequent register. Don't repeat ROZ when screen over process is equal to 1, fixes (MESS) D-Xhird practice stage. Implemented vertical cell scroll ((MESS) Sonic Jam) (video\stvvdp2.cpp). Fixed transparent sprite shadows (Game Tengoku and (MESS) Pretty Fighter X). Disable transmask code for mode 2 sprites, fix Sasissu racing stage background clouds color (video\stvvdp1.cpp). Fixed potential bug with window Y sizes when double density interlace is enabled (video\stvvdp2.cpp). Fixed illegal sprite mode in diehard and dnmtdeka [Angelo Salese].