The VM window is configured with a 1600 x 900 resolution, and covers about 3200 x 1800 pixels on the Retina display. On my iMac host with Retina display, I generally use(d) a Scale Factor of 200% for my Linux guest (and other guests as well). Today I started a detailed investigation: I see various other forum posts asking about slow performances of guests on macbook pro that may relate, but they didn't seem like good matches, hence the new topic.
I modified ticket 16436 with my observations, comments #114 and #115, see.
With emacs, typing fast results in duplicate key press events and other lagging behavior. On releasing, the scrolling continues for a while. The test involves bringing up a long page in firefox, then pressing up- or down-arrow for a bit. I can replicate the behavior with the "test" xubuntu on the installation disk, once I change the display resolution to 1280x1024 on 200% scaling. The behavior does not occur for the "soft keyboard" provided by VirtualBox, only for the macbook pro keyboard. On a new macbook pro 13" with 16GB memory and quadcore i7, and with VirtualBox 6.1.11 and 6.1.12 (other versions not tested), I am seeing slow and lagging keyboard response for xubuntu guest applications such as emacs and firefox, independent of the display scaling but only if the window fills a good fraction of the laptop screen.
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