Delays in typing in Cyrillic
I have Ubuntu 20.04 installed as a virtual machine on Synology DS718+. I run the latest TeamViewer (15.9.4) on Ubuntu and connect to it from Windows / iOS / Android.
If I type Cyrillic letters (while being connected to Ubuntu via TeamViewer) then I have huge lags between the moment when I press a key on a keyboard until the typed key is shown in the Ubuntu's interface. In case I type one letter in Cyrillic I have a lag which is approx. 1 second, but in case I type several letter then the lag is very long (more than 5 seconds, depending on how much text I type). Therefore, it is practically impossible to type text in Cyrillic. There are no issues when I type Latin letters (while being connect to Ubuntu via TeamViewer).
I've tried to connect to Ubuntu through other protocols (VNC and RDP) - there are no such lags. Moreover there are no lags if I connect to Ubuntu via Synology's web browser interface. Therefore, my suggestion is that there is something wrong with TeamViewer, but I don't know whether this is just a bug or there is an important reason why there should be such lags.
Does anyone know why these lags are happening and how to get rid of them?