how to enhance decoder's performance ?

[shukewt]

If I show two 720p png,the decoder performance is terrible,the fps almost half lower than just show one picture,but if I replace one of it with a c array it works well.I'm sure the chip I'm using is powerful enouth to decode this so I wonder if there is some problem such as memory allowcation or some options I didn't notice? Can you give some advice about how to locate this problem.

[shukewt]

One of the picture have to be refreshed periodically and the other one will only be loaded once,does the static one still keep the resource after it has been loaded?

[kisvegabor]

Set LV_IMG_CACHE_DEF_SIZE to at least 2 for 2 images. It tells LVGL how many images to keep open. If it's 0 the image is decoded many times on demand instead of being cached.