Graphics performance loss

[gui-lux]

Bug Description

Hi everyone !

I've just built the 2.5.0 release on rpi5/raspbian and the waveforms display became choppy again.
I'm saying "again" as a follow-up of #12841. All symptoms described in this issue are back again.
Of course, I ran 'debian_buildenv.sh' prior to building.
60 FPS used to work fine with v2.4.2. So I tried to decrease FPS. 30 FPS are still choppy and many dropped frames. 25 FPS gives less dropped frames but the display is still choppy.
OpenGL status shows : 3.1 Mesa 23.2.1-1~bpo12+rpt3 (V3D 7.1)
I haven't seen anything weird about CPU load and the audio is fine.

Thx a lot for your support.

Version

2.5.0

OS

Raspbian