My globe button 'fn' doesn't change input source immediately, and always it works normally after several clicks

Does Control Space work better?

wenxiang178 Said:

"My globe button 'fn' doesn't change input source immediately, and always it works normally after several clicks: I use 'fn' key as a global method to switch the input language method, but it always no response after I click the key. sometimes, I have not already clicked the key several times before it works, how to fix it, looking forward to relying as soon as possible."

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Function (FN) Key Not Working:

A. Hold Down fn:

So, what happens when you hold down "fn" and then press this?

B. Lagging Mac:

Perhaps the Mac is lagging? Having little storage space can most certain lead to attenuations of taping keys briefly. So, to view how much internal storage space is left, use Disk Utility:

1. Click: the Desktop
2. Click: Go menu
3. Select: Utilities
4. View: the white line on remaining space.