Performance issue, about 500ms delay on v4.5.0/win11Canary

[MerrickZ]

A significant ~500ms delay occurs when triggering the full preview (pressing the spacebar) in v4.5.0.

Reproduction Steps

• Select any file (image, video, text file — all tested)
• Press the spacebar to open the preview window

Expected Behavior (as in v3.4.0)

Preview window opens instantly with no perceptible delay when pressing spacebar.

Actual Behavior (v4.5.0)

Consistent ~500ms lag between pressing spacebar and the preview window appearing (reproducible across all file types).

System Info

Microsoft Windows 11 Pro Insider Preview 10.0.26300 Build 26300
CPU: Intel64 Family 6 Model 154 Stepping 4 GenuineIntel ~1700 Mhz

[MerrickZ]

作为对比，使用 Powertoys Peek 的话，几乎没有延迟。

[emako]

Could you try option <ShowWindowTransition>False</ShowWindowTransition> in the preview version?

Preview version: https://github.com/QL-Win/QuickLook/releases/tag/latest
How to use option: https://github.com/QL-Win/QuickLook/blob/master/OPTIONS.md

[MerrickZ]

This version performs better.

However, the following issues remain:

1. On the first launch, the tray icon’s right-click function is unresponsive for roughly 5–10 seconds.
2. With software decoding enabled by default, the first preview of a ~1 MB video file has a 3-second delay. Switching to hardware decoding noticeably improves the speed.
3. When pressing the Space key to preview images, there is still a 200–500 ms lag before the window appears. PDFs load faster than images in this scenario.

maybe this is an image viewer plugin issue?