https://bugs.kde.org/show_bug.cgi?id=522991

Joe Alec <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |REPORTED
         Resolution|WAITINGFORINFO              |---

--- Comment #4 from Joe Alec <[email protected]> ---
Sorry for the late response, there's been multiple updates so I updated to
latest version
```
$ kinfo

Operating System: Fedora Linux 44
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.1
Kernel Version: 7.1.9-200.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 20 × 12th Gen Intel® Core™ i9-12900H
Memory: 32 GiB of RAM (31.0 GiB usable)
Graphics Processor 1: Intel® Iris® Xe Graphics
Graphics Processor 2: NVIDIA GeForce RTX 3070 Ti Laptop GPU

$ kwin --version
kwin 6.7.4

$ kwin_wayland --version
kwin 6.7.4
```

Some obervations first comparing the current kwin version `6.7.4` against the
original when the bug was reported `6.7.2`

# Positives
- Vulkan games do not seem to massively drop FPS any longer

# Negatives
- Vulkan games suffer from a very jarring visible stutter when the game is
rendering on the external monitor via NVIDIA, although mangohud shows stable
FPS. The game I tested was GTA IV rendering via the external NVIDIA GPU

- OpenGL games (Antichamber game for example) still suffers from the massive
FPS drop to 30 then back up to 60 very frequently, the game is rendering on the
internal Intel GPU
  * If I move the game window to the internal monitor >> then no FPS drop
happens at all
  * If I move the game window to the external monitor >> then the FPS drops
massively very frequently

It seems all the trouble happen when copying the render buffer from the
internal GPU to the external one.
On the older kwin `6.6.4` none of that happens.

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