Bug 506606

Summary:	Kdenlive timeline slow when working with and color grading 4k clips on long projects on mid range hardware
Product:	[Applications] kdenlive	Reporter:	agapp11 <agapp11>
Component:	Timeline & Editing	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	REPORTED ---
Severity:	normal
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description agapp11@hotmail.com 2025-07-04 20:51:19 UTC

SUMMARY
Kdenlive timeline slow when working with 4k clips. Also color grading is impossible with proxy clips due to quality of clips being too low to see.

STEPS TO REPRODUCE
1. Import 4k log footage on laptop with discrete gpu
2. Clips not using proxy
3. Attempt to color grade full project (15 mins), kdenlive slows down particularly with many effects

OBSERVED RESULT
Kdenlive slows to a crawl and it becomes impossible to check footage without rendering and waiting for it to render. This slows workflow and makes it difficult to use

EXPECTED RESULT
Kdenlive offloads some of the work to the gpu

SOFTWARE/OS VERSIONS
obs-vkcapture] Init Vulkan 1.5.2 (64bit)
Operating System: Arch Linux 
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-10750H CPU @ 2.60GHz
Memory: 24 GiB of RAM (23.3 GiB usable)
Graphics Processor 1: NVIDIA GeForce RTX 2060
Graphics Processor 2: Intel® UHD Graphics

ADDITIONAL INFORMATION