Since at least LU-358267 (or one version before), I've been having seemingly random 'hitches' in the game that hadn't been happening before. I was testing a build in space in a sandbox save and I noticed that the hitch actually coincides with the broken planet spawning in on the left of the screen. Though it's not an immediate thing... you see the planet spawn, a brief period of time passes (about a second at slowest game speed, but it is game speed dependant), then the game hitches slightly and the planet starts moving.
Nothing special here. The hitch seems to happen on all my saves, be they brand new sandbox or 600 cycles in a normal base.