BUG: New Rendering Engine On High Resolutions (4K) Fullscreen very slow with multiple sessions
If you use the Beta App or the "normal" App with "Use the new terminal rendering engine" enabled by default, you'll have a high CPU load plus an very slow terminal session if you use the software on more than half a 4K screen. It's even worse if you're using multiple sessions to a single or different host.
-> 2 (27" inch) 4K with scaling to 2560
-> 1 (32" inch) 4K with scaling to 3008
-> macOS 10.14.6
-> MacBook Pro 15" 2018