Emulator

Game Name?

Probably all of them (tested with Super Smash Bros, Wii Sport and Mario Kart)

Game ID? (right click the game in the game list, properties, info tab)
Wii sport : RSPP01 (0001000052535050)
Super Smash Bros Brawl: RSBE01 (0001000052534245)
Mario Kart: RMCP01 (00010004524d4350)

MD5 Hash? (right click the game in the game list, properties, info tab, MD5 Hash: Compute)

Mario Kart: f149e293249aea30decf77c9d5604d29
Wii sport: 197fa7bd7a4abc0c761057402ce194f1
Super Smash Bros: d18726e6dfdc8bdbdad540b561051087

What's the problem? Describe what went wrong.

Since macOS Mojave, OpenGL is deprecated and was replaced with another driver named Metal 2. Since dolphin doesn't support it, it causes major fps drops, crashes sometimes and games textures not loading properly (maybe a rendering problem ?).

What steps will reproduce the problem?

1: Boot Dolphin
2: Load a game

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
version number : 5.0-8633

Is the issue present in the latest stable version?

Yes
5.0

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.)

[First broken version number here (if applicable)]

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

The two fifologs are from Mario Kart player selecting screen and the game mode screen.

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

OS: MacOS Mojave 10.14
CPU: 3.3 GHz Intel Core i7
GPU: Intel Iris Graphics 550 1536 Mp

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

I would've put some screenshots, but it doesn't seems to affect screenshots.