Emulator

Game Name?

Mario Kart 64 for WiiWare

Game ID? (right click the game in the game list, Properties, Info tab)
(Tested multiple WADs)
NABJ01 (000100014e41424a)
NABE01 (000100014e414245)

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

1ed418d6efbb5f4a690b4e0471a63b21 (JP)
29c42717a5f6b555b73139274395dfc2 (US)

What's the problem? Describe what went wrong.

The problem only occurs in NetPlay. When you select a course with multiple players (Grand Prix or otherwise) some courses are too fast. The problem seems to get worse the more players you have playing in the round.
Even courses that aren't super bad with 2 players can be unplayable with 4 for example. The best example of this problem however is in DK Jungle Parkway.

What steps will reproduce the problem?

Reproducing this is easy. Merely starting NetPlay with multiple players will reproduce the issue. You don't need to have other people actually connected to the lobby, you can have multiple controllers setup to get into multiplayer to reproduce this bug. I have tested this with multiple WADs. Dolphin settings don't seem to matter in reproducing this bug.

The easiest step by step way that I could suggest for someone who hasn't played this game to reproduce this bug would be:

1. Make sure you have 2 controllers configured and start NetPlay. (Or have friends help)

2. Press the 2 player (or more) versus mode.

3. Select any character (it does not matter).

4. Move the selection to the Special Cup and select DK Jungle Parkway (should be the first option).

5. Behold lightspeed gaming.

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 is. Version 17199

Is the issue present in the latest stable version?

N/A as the latest stable version doesn't have NetPlay

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.)

I'm unable to find a version where it works properly.

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

Intel I7-10750H
Nvidia Quadro RTX 5000
16GB GDDR5 ram