On Thu, 19 Mar 2020 12:52:14 +0100 Hans de Goede <hdegoede@xxxxxxxxxx> wrote: > Hi, > > On 3/19/20 12:35 PM, Michel Dänzer wrote: > > On 2020-03-18 4:22 p.m., Simon Ser wrote: > >>> > >>> On 3/18/20 3:38 PM, Simon Ser wrote: > >>>> > >>>>> 1) Letting the VM-viewer window-system draw the cursor as it normally > >>>>> would draw it. > >>>> > >>>> Why is this important? Can't the VM viewer hide the cursor and use a > >>>> sub-surface to manually draw the cursor plane configured by the guest? > >>> > >>> Because then moving the cursor as seen by the user requires a round trip > >>> through the VM and that adds latency, esp. when the VM viewer is viewing > >>> a VM which is running somewhere else over the network. > >> > >> The video output has latency anyway. > > > > Sounds like you've never tried the two different modes yourself? :) IME > > it makes a big difference even with a local VM. Even very little latency > > can make the cursor feel awkward, like it's being held back by a rubber > > band or something. > > Right not to mention that the latency may be variable, so the cursor > moves in a jittery fashion instead of having it move smoothly > matching the smooth way a user normally moves the mouse. > > This totally wrecks hand-eye coordination and is just plain awefull. I have experienced it, and while it is painful, I prefer that pain over the pain of accidentally clicking something that was not transmitted to the remote display yet. Therefore I think the best user experience is to use both types of cursor at the same time: the remote desktop or VM viewer paints the local cursor as an aid, like a phantom, and the cursor from inside the VM is also visible with the latency it naturally has. That means I could actually see that the screen has caught up with my motions before I click something. Thanks, pq
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