I received from support something like this:
"Unchecking the Poll On Event Only option should increase the refresh rate. Could you follow the instructions in
this knowledge base article, which explains how to uncheck this option and optimize your other settings as well. This should resolve the issue.
We did create a new version of the Remote Control tool as well, which uses a newer version of UltraVNC to perform the remote control session. You may wish to download this new version here and add it to the Program Files (x86)\Lansweeper\Actions folder on your Lansweeper server. You would most likely still have disable Poll On Event Only to increase the refresh rate though."
but it still NOT resolve problem (I did configuration from this messege and update uVNC app in Actions folder).
Any ideas?