ESP32-S3 with RGB interface LCD - lagging/delay in screen rendering issue

[tushar@esp]

We are good with 4" (480x480) and 4.3" (480x272) TFT LCD RGB display with ESP32-S3R8.

Now, we are working on 5" (800X480) RGB LCD. I am using the latest idf master branch,
Commit ID: fde4afc67a2035a1f461dc511cd85dde1ef90368 Date: 29-July-2022.

We are observing glitches while the entire screen changes i.e one screen to another screen, scrolling in such a way that the entire screen area is being changed.

As per the LCD datasheet, the typical clk is 25MHz.
When I set 25 MHz, the UI is continuously moving. I changed it and fine-tuned it to 18MHz, then the screen UI is stable.

Is there any limit of the LCD clk interface from MCU while using the PSRAM octal mode? Please suggest any configuration that helps to remove the glitches on the screen change.