Poor Performance under Linux

I’m working with KNIME under Windows and several Linux since many years. Apx. since the last year I need to develop and run my KNIME-Workflows under Oracle-Linux 8.0 via RDP over SSH-Tunnel. The Linux-Server is a virtual Machine under VM-Ware (16 Cores, 128GB RAM). I notice very poor Performance under these circumstances. Inserting and moving Nodes in the Canvas is lagging, making Connections is lagging, resetting and starting one or more nodes is lagging. Has anyone had similar experiences and possibly found a solution for me?