Gif on brain. (Sort of)

[Cadaver_42]

@Robiscool

but can’t since the brain doesn’t support it?

Hmm I was under the impression that it does.
Animated GIF Demo (VEXcode)

One suggestion is to use a for loop instead so that instead of having a new draw image command for every frame, you can iterate through each file. This would let you have as many files as you want using some bulk rename software to increment the name index. Then your entire loop consists of modifying the file name string with an iterator, printing, and waiting.
Then there is this:

When continuously reading the content of SD card and printing it on the screen, as time goes by, the refresh rate decreases

Does this mean you have hundreds, perhaps thousands, of images on the SD Card ? The issue is that opening the file will take longer if the firmware has to search through many directory entries. So yes, the apparent time to open an image may take longer. Have a small number of files on the SD Card. It’s better to have one large file that you access for data and keep that large file open. That’s how I did the video playback in this post.