Emulator

Game Name?

Let's go by train Shinkansen EX

Game ID? (right click the game in the game list, Properties, Info tab)

RG4JC0 (000100005247344a)

MD5 Hash? (right click the game in the game list, Properties, Verify tab, Verify Integrity button)

c484dc988a292c156ac90dabe225fcb8

What's the problem? Describe what went wrong.

The gameplay drops to too slow a frame rate (from normal 60fps to 30fps or even lower) to affect gaming experience in some train driving scenarios.

What steps will reproduce the problem?

It could be reproduced by getting into the game, select "Driving Mode" and then "route 05 - 100 kodama" under the default "digest - introduction" category. Once you are in the train driving mode, you will see the frame rate drops to 30fps and essentially the game runs half of the normal speed.

Here is a video showing how the problem could be reproduced using some other step: [[https://www.youtube.com/watch?v=ybTmS1WRGd4]]

Is the issue present in the latest development version? For future reference, please also write down the version number of the latest development version.

Yes. It appears in the latest development version dolphin-master-5.0-16443-x64.

Is the issue present in the latest stable version?

Yes. It appears in the latest stable version 5.0.
There is a report online saying that Dolphin stable version 3.5 doesn't have such an issue. See the comment at [[https://www.youtube.com/watch?v=ybTmS1WRGd4&lc=Ugy8PI6cKO3NW2i8k7t4AaABAg.9Huiwexscyv9Iyb9c4zErV]]. I couldn't get the game started on my laptop with that 3.5 version (graphic driver issue - probably due to that my graphic card is too new for this old version to support) so I couldn't verify it myself. I did try stable version 4.0 and it has the issue.

If the issue isn't present in the latest stable version, which is the first broken version? (You can find the first broken version by bisecting. Windows users can use the tool https://forums.dolphin-emu.org/Thread-green-notice-development-thread-unofficial-dolphin-bisection-tool-for-finding-broken-builds and anyone who is building Dolphin on their own can use git bisect.)

N/A

If your issue is a graphical issue, please attach screenshots and record a three frame fifolog of the issue if possible. Screenshots showing what it is supposed to look like from either console or older builds of Dolphin will help too. For more information on how to use the fifoplayer, please check here: https://wiki.dolphin-emu.org/index.php?title=FifoPlayer

N/A

What are your PC specifications? (CPU, GPU, Operating System, more)

Model: MSI GF65 Thin 9SEXR
CPU: Processor Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz, 2401 Mhz, 4 Core(s), 8 Logical Processor(s)
GPU: Nvidia GeForce RTX2060
OS: Windows 11

Is there anything else that can help developers narrow down the issue? (e.g. logs, screenshots,
configuration files, savefiles, savestates)

I have tried both Direct3D and Vulkan and see the same issue.
Some people believe that the problem could be resolved by allowing constant bit rate. See https://forums.dolphin-emu.org/Thread-densha-de-go-ex-dolphin-master-5-0-12330-x64?highlight=densha.