Switching input language in Windows 10 is not always instant

I use CTRL+SHIFT on both Linux and Windows to switch between input languages.
Under Linux the switch is always instantaneous, meaning a quick and light touch of the CTRL+SHIFT combo suffices - I don't have to hold the key combo down or to press it several times until finally the switch successfully occurs. This is regardless of what applications I am running at the moment.

This is not the case in Windows. I often find myself having to press the CTRL+SHIFT combo several times or to hold it down until the input language is actually switched. While I cannot always reproduce the issue, I have noticed that for example it often happens when I am using a browser - maybe because I then switch the languages more frequently, for example due to chatting with different people in facebook or similar. Also, I am pretty sure that I don't have a stuck key on my keyboard.

I had this problem in Windows 7 as well but never looked into it. I believe I was able at some point to figure out how to fix this in Windows 10, but after some 'quality updates' (that probably reset some stuff in Windows 10 anyway) I cannot pinpoint the relevant settings. My guess is that it has something to do with how Windows treats sticky keys and key combos, which itself has probably changed since.

Personally, I find that latency unnecessary and even annoying.

Current OS: Windows 10 x64 (1803)

Does anyone know how to remove or reduce the delay of switching between input languages in Windows 10?

Feel free to add more relevant tags.

EDIT: Sticky keys and Filter keys are off in the Settings panel.

Answer

Go to Settings->Time&Language->Region&language->Advanced keyboard settings->Language bar options->Advanced Key Settings->Change Key Sequence.

Change the shortcut below Switch Input Language to see if this issue still occurs.

Nowadays,the default shortcut to switch input language of computers running Windows 10 is so strange. Some are left Alt+Shift, some are Ctrl+Space, and some are even Windows+Space. Then, some shortcut keys work fine, and some shortcut keys have a high delay. And I am not very clear about what caused this.

Also, switching the input language will have high latency when the memory is too high (of course you might have considered this).