I've also (unfortunately) noticed that Chrome is much more responsive on Linux than Firefox on several different machines.

In fact, on a resource-constrained VDI for internet access (for security reasons), I've also noticed that Chrome seems to prioritise interaction of the UI elements much more than Firefox does: in Firefox I've often noticed that when the page has animated items (whether gifs, videos, etc), Firefox seems to prioritise playing back the content over responding to keyboard or mouse events (i.e. page up or Ctrl+W), and can often take multiple seconds to respond, whereas Chrome responds to events much faster. Maybe it's something with the event loop?