An interesting observation. Jerking in browser slots on powerful hardware is almost always caused by unoptimized graphics or poor WebGL implementation on the developer's end. Many game providers impose a frame rate cap (usually 30 or 60 FPS) to ensure a consistent experience across all devices, but this shouldn't cause stuttering. I ran tests on the https://frumziau.com/ website: on a 240Hz monitor, the animation was smooth, thanks to the use of modern adaptive rendering technology. However, some other platforms do experience lag due to the games being compiled in an outdated Flash emulation format. Whether this affects the player's experience is certainly questionable, as smoothness affects reaction speed and probability estimation. However, it doesn't affect the game's outcome, as the RNG on the server runs independently. I recommend trying the game in different browsers: Chrome with hardware acceleration enabled often runs smoother. You can also look for "lightweight" versions of games without 3D animation, if your provider offers them.