Sudden High CPU Usage - Windows

Forum|Forum|10 months ago
April 15, 2025
3 replies
361 views

I have worked with 4K footage on two projects recently that are incredibly laggy and using >90% CPU usage.

This did not used to happen. I have seamlessly worked on 4k and 6k footage in HEVC encoding in premiere projects with no issue, adding transitions and effects.

Now I can't even scrub through a timeline of just footage without serious lag and I'm not sure what could be causing it. I attempted to change the encoding of files from HEVC to ProRes which helped but it also quintupled my file size which isn't sustainable.

Oddly, when I go back into older projects with similar footage and codecs there are no issues, it works smoothly, which makes me think the projects must be corrupted, however when I tried copying and pasting the footage across into a new project I got the same issues.

I have tried updating premiere, updating windows, clearing my media cache, keeping my preview window at 1/8 quality, ensuring hardware encoding is enabled and setting premiere as priority in task manager. I'm not sure what else I can do so any help would be really appreciated.

my PC hardware specs:
- i7-14700KF

- RTX 4070S

- 32GB DDR5 RAM 5600MHz

- 2TB SSD

jamieclarke

Community Manager

Hi @Hollbird - It was great speaking with you. To summarize the call, we identified that the media in these projects is HEVC 10-bit 4:2:2. Your process you have and the GPU you have do not provide hardware acceleration for that format so we would expect you to see poor performance in any editing application, including Premiere Pro.

The workarounds we discussed were either creating proxies or you asking your client to shoot in HEVC 10-bit 4:2:0, which your computer's GPU does hardware acceleration.

Lastly, we mentioned that Intel CPUs with QuickSync and NVIDIA Blackwell GPUs do provide hardware acceleration for HEVC 10-bit 4:2:2, as do all Apple silicon Macintosh computers.

Please don’t hesitate to reach out if you have any further questions or run into any other issues.

Regards,

Jamie

Fergus H

Community Manager

@Hollbird I sent you an email. We would be interested in getting on a call with you to discuss the issue you're seeing.

Regards,

Fergus

S

Sumeet Kumar Choubey

Community Manager

Hi Hollbird,

Welcome to the community, & I'm sorry to hear about the poor experience. We can get this checked. Could you please share the other specifications of the media files (frame rate, bit depth & chroma subsampling) & the effects applied? Please also ensure that under File > Project Settings > General, Renderer is set to Mercury Playback Engine GPU Acceleration (CUDA).

Thanks,

Sumeet

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