Buttons slow down Macbook Air when switching layouts, how to fix it?

Question

macbook

I have a macbook air highierra 10.13.4 When switching the keyboard layout from one language to another, the buttons stop working normally, namely at first they simply do not respond to pressure, then one of the letters appears, then you continue typing, but randomly different letters appear, such a disgrace last 5-10 seconds. I even in this message did not switch to the English layout, so as not to slow down.
This greatly interferes, because I print in two languages, I correspond in two languages, but I never get a quick response to a message.
I thought that sticky keys were on, but no, everything is off there.
Who will help?