Although it might sound ridiculous to some, the truth is that over-optimizing
especially without limiting the FPS—can lead to stability issues. This is even more likely if the game is running on a pre-2014 engine."

It can cause FPS and animations to behave unpredictably.

It may lead to game crashes.

It increases the likelihood of strange bugs or glitches in the environment.

Cap the frame rate
Use an FPS limiter (e.g., VSync, Application.targetFrameRate, or external tools) to prevent your game from running unnecessarily fast and causing instability.

Avoid micro-optimizing early
Focus on stable, readable code and only optimize sections that measurably impact performance.

Test across hardware
Especially on older or lower-end systems, make sure your optimizations don’t introduce bugs or instability.

Respect engine limitations
Older engines (especially pre-2014) weren’t built for modern optimization techniques. Stick to best practices recommended for that engine’s version.

Throttle background tasks
If your game has logic running too fast (like physics or AI updates), ensure those systems are time-step based and properly throttled.