zed-industries
Many frames of latency between input and render
Summary
Zed shows multiple frames of latency (I count at least four) between input and render. See the attached video for an example:
https://github.com/user-attachments/assets/09cae02e-3bdf-4f85-9090-2cfc9981a5f0
Steps to trigger the problem:
See video.
Any user input (selection, typing, etc) is not reflected for several frames.
If it turns out to be relevant, I'm viewing on a 4K monitor. Other apps do not seem to show this level of latency.
Actual Behavior:
Lag can be seen when sweep selecting text; observe the difference in pointer position and the end of the selection in the document. You can count the frames between when the pointer reaches an extreme of its oscillation to when the selection reaches the same extreme.
There is also a similar delay in typing, though this is harder to show with video or measure concretely. It manifests as a strong experience of sluggishness when typing.
Expected Behavior:
I would expect no more than one frame of input latency. The demonstration video on Zed's main page advertises 120fps rendering.
Zed Version and System Specs
Zed: v0.177.9 (Zed) OS: macOS 15.3.2 Memory: 32 GiB Architecture: x86_64
That is definitely an excess delay, and Is very difficult to reproduce with the suped-up m-series macs most of us use. Thanks for providing such a clear visualization!
I'm having the same problem, it's particularly noticeable when using vim mode since you're typing constantly.
Zed Version and System Specs
Zed: v0.183.12 (Zed) OS: macOS 15.3 Memory: 16 GiB Architecture: x86_64 (integrated GPU)
https://github.com/user-attachments/assets/12057c25-8f6a-43e9-a457-24f890145eef
I have the same problem.It is very obvious when using the mouse to click.
Zed Version and System Specs Zed: v0.187.9 OS: macOS 15.5 Memory: 32 GB CPU: 2 GHz 4Core Intel Core i5 integrated GPU：Intel Iris Plus Graphics 1536 MB
I have the same problem. There is noticeably more delay typing than in other programs.
Zed 0.193.3 1.2GHz 4-core Intel Core i7, Iris Plus 16 GB memory macOS 14.6.1
Same.
- Zed 0.198.5 on macOS Version 15.6 (24G84)
- 2 GHz Quad-Core Intel Core i5
- Intel Iris Plus Graphics 1536 MB
- 16 GB 3733 MHz LPDDR4X
@j-c-m how were those metrics collected? I'd love to use whatever you did in trying to address this problem
@j-c-m how were those metrics collected? I'd love to use whatever you did in trying to address this problem
https://github.com/frarees/typometer
It can be a bit temperamental with things around the cursor changing or popping up, so I pre-seed the line with some ..... to avoid ligatures.
Current run just to make sure everything is still looking similar to before.