Low FPS, no higher than 26, even with a blank screen.

[brightproject]

Equipment:

• win 10
• lv_platformio simulator
• lvgl 9.3

What could be the reason for low FPS?

Benchmark

Empty display

[fbiego]

The reason the FPS does not go above 30 is due to the default refresh period, which is set to 33 milliseconds. This effectively limits the maximum achievable FPS to approximately 30 FPS (1000 ms ÷ 33 ms ≈ 30 FPS).

/** Default display refresh, input device read and animation step period. */
#define LV_DEF_REFR_PERIOD  33      /**< [ms] */

This is typically the theoretical maximum FPS. The actual FPS may be lower depending on the processing time required to render each frame, including the complexity of the UI and the hardware performance.

If you need a higher FPS, you can reduce the refresh period by adjusting the configuration. Lowering the refresh period will allow LVGL to refresh the screen more frequently, enabling higher frame rates.

Keep in mind, though, that very high FPS may cause the content to become less perceivable due to the rapid changes exceeding human visual integration thresholds.