Participant

Lag when changing speed (Time Remapping) in Premiere Pro 26

Forum|Forum|4 days ago
March 27, 2026
3 replies
45 views

Severe lag occurs when changing speed (Speed/Duration or Time Remapping) in Premiere Pro.

- The issue happens immediately after applying speed changes

- Playback becomes very laggy, with stuttering and dropped frames

- The footage is simple 1080p H.264 (no effects, no color grading, no plugins)

- The same exact workflow works perfectly in version 25.5 with smooth playback

- The issue appears only in versions 25.6 and above (including 26.0.2)

System specs:

- CPU: i7-10750H

- RAM: 16GB

- GPU: RTX 2070

This appears to be a regression bug related to speed processing and playback performance.

No lag occurs before applying speed changes — only after speed is modified.

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Rach McIntire

Community Manager

Hi @الترند29689029vc8g ,

Thanks for the detailed report and the video demonstrating the issue. Could you also share the full video specs from MediaInfo? Long-GOP H.264 can be a factor with speed changes, and it would help to see the full picture.

Normally, it wouldn't make a huge difference, but with 16 GB of RAM, you are at the minimum Adobe recommends for HD editing. From 25.6 onwards, a number of AI features were added to Premiere, which could be why 25.5 works more smoothly. If you disable Media Intelligence, which runs in the background, does that make a difference?

A few follow-up questions that would help us dig into this further:

* Are you using Speed/Duration, Time Remapping, or both?

* Does the lag occur with any speed value, or only certain ranges (e.g., slow motion below 50%)?

* Is hardware-accelerated decoding enabled in Preferences?

* Are you working from local storage or an external/network drive?

If you can also share a sample clip that reproduces the issue, that would be really helpful. Feel free to DM me if you prefer. Sorry for the frustration. I hope we can get this sorted soon.

Ann Bens

Community Expert

Tried rendering the file?

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الترند29689029vc8gAuthor

Participant

Thanks for your suggestion.

Rendering does improve playback temporarily, but it is not a practical solution for my workflow.

The issue only occurs when changing speed (Time Remapping), and it does not happen at all in Premiere Pro 25.5 using the same footage and system.

This indicates that the problem is not related to playback performance alone, but likely a regression in newer versions.

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الترند29689029vc8gAuthor

Participant

Additional info:

The issue happens only when speed is modified.

Normal playback is completely smooth before applying speed changes.

R Neil Haugen

Legend

Your issue is the massive new computational load you created with the time ramping.

Do you understand what long-GOP media is? Threre are only a very, very few real frames of video in that file. All the ‘frames’ in-between “i-frames” are only charts! Truely.

The charts list which pixels will change 1) before the next i-frame or 2) have changed since the last i-frame or ... 3) ... both.

So for basic playback the computer has to find any relevant i-frames, both in front of and behind the ‘current’ displayed frame, and recreate EVERY one of those frames by blending the i-frames and charts just to display the next single frame.

Apparently your computer is keeping up with this task for basic playback. But in any speed-changes or ramping, you add additional computational loads to create new frames or change how they are displayed.

At which point your computer is getting overloaded.

You could for simply getting it done make proxies or t-codes. Basic video post tasks.

Everyone's mileage always varies ...

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الترند29689029vc8gAuthor

Participant

Thanks for the detailed explanation.

I understand how long-GOP media like H.264 can increase computational load, especially with speed changes.

However, the exact same footage, same system, and same workflow work perfectly fine in Premiere Pro 25.5 with smooth playback — even when applying speed changes.

The issue only appears in versions 25.6 and above.

This suggests that the problem is not related to media format limitations, but rather a regression in how newer versions handle speed processing and playback.

I’ve also attached a video showing the issue clearly.

This behavior changed after updating from 25.5, which indicates a clear performance regression.

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