Don't ask me why, it is just an observation. My thinking is that if the guest is not touching or going beyond the host screen, rendering calculations seem to respond fairly smoothly. This should still make it bigger than normal window mode and I'm sure some xorg gurus can tweak it to within a pixel of the screen edge.įind the host resolution and then go to fullscreen mode, set the guest resolution to (ideally) the same ratio but slightly smaller than the host.

What I found to work for me is to use a resolution that leaves a slight gap on all edges.

However in normal windows (maximised but not fullscreen mode) the lag was minimal and totaly useable. What I have noticed is that (for me) in full screen mode everything lagged so much that it stopped re-rendering until I moved the mouse, then the blocks I hovered over would re-render. I have been struggling with this for a long time with a pretty good spec Windows 10 host and Ubuntu 18.04 guest that was totally unusable due to slow graphics, and I read tons of different suggestions that made minor differences but nothing made it useable. Please contact the moderators of this subreddit if you have any questions or concerns.I have found a reasonable solution that works for me. I am a bot, and this action was performed automatically. Thanks for taking the time to help us help you! Also, PLEASE remember to change the flair of your post to Solved after you have been helped! Your post has not been deleted - do not re-submit it. If you have met these requirements, you can ignore this comment. If this is your first time creating a virtual machine, we have a guide on our wiki that covers the important steps. Please also check our FAQ and if you find your question is answered there, PLEASE remove your post or at least change the flair to Solved. Please check Google and the VirtualBox Manual before asking simple questions. PLUS a detailed description of the problem, what research you have done, and the steps you have taken to fix it. Whether you have installed Guest Additions and/or Host Extensions (this solves 90% of the problems we see) Whether you have enabled VT-x/AMD-V (applicable to all hosts running 6.1 and above) and disabled HyperV (applicable to Windows 10 Hosts) This is just a friendly reminder in case you missed it.

Virtualbox windows 10 laggy