Short description of the issue:
On macOS (Apple Silicon), pressing Caps Lock to switch input languages using the default input method causes severe lag, regardless of the active interface. This is visible as a red line (FPS drop) on the F3 debug graph.
Steps to reproduce the issue:
Use an Apple Silicon Mac with the default input method configured to switch languages via the Caps Lock key.
Launch Minecraft 26.3 Snapshot 6.
Open the F3 debug screen and display the FPS graph.
Press the Caps Lock key in any interface.
Observe the severe lag and the red line on the FPS graph.
Expected result:
The game runs normally without lag.
Actual result:
Severe lag occurs.
chinese:
Short description of the issue
在搭载了apple silicon的macos上，运行最新块照版时，使用maocs自带的输入法，不管在任何界面，只要按了大写锁定键切换中英文，游戏会发生剧烈卡顿，在f3的fps图标上显示为一根红线
Steps to reproduce the issue
apple silicon macos，使用自带输入法，并且是大写锁定键切换中英文的配置 → 26.3-snapshot6 → 任意界面，打开f3和fps图标 → 按下大写锁定键 → 观察到剧烈卡顿，图标上一根红线
Expected result
正常运行
Actual result
剧烈卡顿
Environment
mac mini m2, macOS Tahoe, java version "25.0.2" 2026-01-20 LTS
Attachments
Comments 4
@Hou_Samuel we can confirm that we see some lag. It appears most problematic the first time after a system restart and less problematic after switching input language multiple times. Our testing has been done on a Macbook with M4 Pro and there the impact is not experienced as severe.
How long lag do you experience? Is it worst the first time you switch?
If you can submit video or images of your experience that could help us understand how bad the situation is.
To answer your questions: the lag I'm seeing is about 1 second, and the frame rate drops to zero immediately when I press Caps Lock. But interestingly, the game's TPS (tick rate) doesn't seem to drop.And it happens pretty much every time, not just the first switch after reboot.
Since you didn't observe anything severe on the M4 Pro under similar conditions, I'm starting to suspect this might be caused by the number of third-party system tools and custom configurations I've installed on my current macOS setup, rather than a core game bug.
It's not a critical blocker for me at the moment, so I'd like to park this ticket for now. If I still see the same issue after a clean system reinstall in the future, I'll reopen this request or file a new one with a video attached. Feel free to close this for now. Thanks again for your time!(AI translated these texts for me, so they might not be very accurate or very polite. Please forgive me.)
Thank you for helping us improve Minecraft! We saved your files: