Hi, you don’t mention what version you are using. We recently fixed a bug in the release affecting 7.8.2 related to mDNS which was causing behaviour like you described.
High CPU usage of NoMachine Client on Ubuntu when listing the available machines and connections
https://knowledgebase.nomachine.com/TR09S10371
If you are using 7.8.2 and don’t want to update to 7.9.2, you can use the workaround mentioned in the TR i.e disable network browsing. Open the client UI -> Settings -> Player -> Security and select ‘Don’t show other computers on the network’.
If you are already using 7.9.2, please send us the exact output of “top”, “top -H” (to also get the exact thread consuming the CPU), “atop” or whatever command you are using to get the system load.” We aren’t aware of reports of abnormal CPU usage in this version.