The live pane runs at twenty-five frames a second instead of about twelve.
It was slow in three places and each one is fixed where it lives: the engine makes what it is asked for, the wrapper passes the request on (invisible-playwright 0.14.0, which this release requires), and the page collects them fast enough to show them.
Ten frames a second stays the right default for the wrapper - a batch job that never looks at a frame should not pay a live view's bandwidth, measured at 257 KB/s against 629 - so the interface asks for more because it is the one watching.