I use more than one language, and that's why I have to change layouts. But after doing it on my laptop, it freezes for a second. It's not a big issue and I can't live with it, but if it can be fixed, I'd like to.
I run the same Ubuntu 18.04 on both my PC and my laptop, and this issue only shows up with the second one (but that's not a surprise, because my PC is for sure way more powerful than my laptop).
I've also used 'Gnome Tweaks' to set layout changing to Alt+Shift, but using default Super+Space seems to make it freeze, too (even though it feels somewhat faster).