[BUG] Games over 60 FPS slow down when interacting with the menu options

[JosepMC154]

The emulator triggers some kind of frame limit for certain games that go over 60 FPS at specific points (e.g. Mario Party trilogy, Custom Robo) whenever you select a menu option or use an overlay, causing performance issues. I'm using the latest nightly as of 2020-12-30 (v.0.6. "Stable-8-g54fcd9"), on an OLED Vita with 3.65. Here's an example of what I mean:

[Rinnegatamante]

Overlays and shaders do add extra steps thus they may cause performance drops.

[JosepMC154]

I understand that, but in the case of these four games, it only happens at very specific points with such a "high" FPS display, just by merely interacting with ImGui and without even using shaders nor overlays. Say in the Mario Party games, they all slow down only during actual board gameplay until the UI bar dissapears.

I'm sorry for not being too clear, but this issue in these four games seems rather inconsistent. I've tested both Mario Party 1 and 2 (EUR) again and both still run full speed on boards even with either shaders or overlays on, but I noticed the following:

• No shader/overlay: Board gameplay runs full speed, until I put the mouse cursor over either "Post-Processing" or "Overlays". When this happens, the emulator's FPS counter goes from to 129ish to 99.9, just like in my screencaps.
• Overlay on: Game slows down to 99.9 FPS as soon as I move the cursor.
• Shader on: No slow down at all. Daedalus's FPS counter also shows the game's actual speed (25 FPS) instead of a ridiciously high number like before.