Super slow maximize animation on Plasma6.7

mpv Information

mpv v0.41.0 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Feb 11 2026 22:07:06
libplacebo version: v7.360.1
FFmpeg version: n8.0.1 (runtime n8.1.2)
FFmpeg library versions:
   libavcodec      62.11.100 (runtime 62.28.102)
   libavdevice     62.1.100 (runtime 62.3.102)
   libavfilter     11.4.100 (runtime 11.14.102)
   libavformat     62.3.100 (runtime 62.12.102)
   libavutil       60.8.100 (runtime 60.26.102)
   libswresample   6.1.100 (runtime 6.3.102)
   libswscale      9.1.100 (runtime 9.5.102)

Other Information

- Linux version:Arch linux
- Kernel Version:Linux laichiaheng 7.1.0-2-cachyos #1 SMP PREEMPT_DYNAMIC Thu, 18 Jun 2026 14:54:05 +0000 x86_64 GNU/Linux
- GPU Model:Navi 48 [Radeon RX 9070/9070 XT/9070 GRE] [1002:7550]
- Mesa/GPU Driver Version:Mesa 26.2.0-devel (git-67a88ee9c8) (LLVM 22.1.6)
- Window Manager and Version:plasma-login-manager 6.7.0-1
- Source of mpv:Arch
- Latest known working version:The current version works on Plasma6.6
- Issue started after the following happened:Update to Plasma6.7

Reproduction Steps

mpv --log-file=fullscreen.txt --no-config /mnt/16TB_HDD/其他/girl.mkv

Expected Behavior

Maximize smoothly.

Actual Behavior

Slow maximize.

Log File

fullscreen.txt

Sample Files

Any video file.
Demo

I carefully read all instruction and confirm that I did the following:

• I tested and confirmed that the issue exists with the latest release version or newer.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

Start by reproducing the issue with the provided mpv command and no configuration on Plasma 6.7, then compare the maximize behavior with Plasma 6.6. Review fullscreen.txt alongside the reproduction details and use the linked demo to identify the affected transition. Done means maximize animation is smooth on Plasma 6.7 without regressing normal video playback.