[Bug]: Severe UI lag and stuttering after stopping recording on macOS (M1)

[CarlosGGGGGG]

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Describe the bug

I'm experiencing significant performance issues when using OpenScreen on a MacBook with Apple Silicon (M1).

Recording itself appears to work fine, but as soon as I stop the recording, the application becomes very laggy and almost unusable.

Observed behavior:

• Immediately after clicking "stop", the app starts lagging
• When the editor view opens:
  -- Playback is extremely choppy (timeline jumps forward in seconds)
• UI interactions (clicks, key presses) are delayed
• Holding any key causes noticeable lag
• The entire app feels like it's freezing intermittently

Important notes:

• During recording, system performance is normal
• CPU usage is NOT maxed out
• macOS itself remains responsive (no system-wide lag)
• The issue seems isolated to OpenScreen’s internal processing/editor

Environment:

• Device: MacBook (Apple Silicon M1)
• macOS: Tahoe 26.4.1 (25E253)
• OpenScreen version: 1.3.0

Expected behavior

• Smooth transition after stopping recording
• Responsive editor UI
• Smooth playback of the recorded clip

To Reproduce

1. Start a screen recording
2. Record for ~1–2 minutes (normal desktop usage: typing, switching browser tabs, etc.)
3. Click the stop button in the toolbar

Screenshots

No response

OS

None

OS Version

MacBook (Apple Silicon M1) Tahoe 26.4.1 (25E253)

Other OS

No response

Browser

None

Browser Version

No response

Other Browser

No response

Device Type

Laptop

Other Device

No response

Additional context

It seems the lag starts during post-processing or when loading the editor (possibly encoding, timeline generation, or preview rendering). The issue is reproducible even with short recordings (~1–2 minutes).

Let me know if logs or screen recordings would help diagnose this further.

[AmitwalaH]

Hey, I’ve been working on the video playback/rendering pipeline and I think this might be caused by continuous PIXI ticker updates and heavy operations (filters + canvas extraction) still running after recording stops.

I’ll try to optimize:

• Stop ticker updates when not playing
• Reduce/disable filters when idle
• Throttle preview canvas extraction

Will open a PR soon with a fix 👍

[siddharthvaddem]

https://github.com/siddharthvaddem/openscreen/actions/runs/24947370830

could you download from here and try? I believe I ran into this as well and made a fix that should resolve this

@CarlosGGGGGG

[Tyris0001]

Hi! I tested the build from the linked Actions run and it performs worse on my macOS setup.

System:

• MacBook Pro (Model Identifier: Mac15,7)
• Chip: Apple M3 Pro (12-core)
• Memory: 18 GB
• macOS: 15.3 (24D5034f)

Build:
Using the build-macos (x64) version.

Issue:
The app stutters badly in the video editor. The recording UI itself seems fine (hover animations and general UI are smooth), but when opening a recording:

• The video preview window is very laggy and stutters heavily
• There is a noticeable delay when pressing space to play/pause
• Overall playback/editing feels significantly worse than the previous version

Steps to reproduce:

1. Open the app
2. Open any recording in the editor
3. Try to play/pause or scrub the video