My guess would be that your software uses a version of JME? I ask because I’m starting to explore libraries myself. At the moment, I use LWJGL, but I start to consider JOGL again.
The refresh rate seemed fast. It maybe hit at least the 50 FPS mark. I meant the game play’s pace. The AI also appeared about twice as aggressive in chasing the player-controlled character than in much older versions. The classic style use to launch an accelerated game where the player’s character could reach any cornering edge of the screen in less than 3 seconds, but the ghosts had a limit placed on the pursuit AI that grew in difficulty as levels became faster. It probably just performed the AI routine for the route adjustment with increased frequency as the levels grew in number. In this game, it seems reversed where the ghosts chase better early on, but the slow pace allows for an easier opportunity to take one’s time. Modern public arcade versions that also offer the Galaga shooter tend to mix both quick pace along with relatively high AI aggression.