Language switcher lag When I am changing the language layout (English &lt;-> Bulgarian) most of the times I have huge lag or even buggy behavior. The language indicator says one thing, but when I type it is in the other language. 
This actually happens on every OSX version I've used the last years (Mountain Lion - Sierra).
Here is a gif of the problem:   



Now I'm totally pissed off and I cannot stand it anymore. Any clues of how to fix it?
Do you have SIRI on?  If so, try turning it off and restarting.

Just in case somebody has the same issue but wants to continue using Siri:
make sure your keyboard shortcut for Siri doesn't conflict with the keyboard switch combination.

Original text:

https://discussions.apple.com/thread/7769867?start=0&amp;tstart=0