OK, so I've got a canvas with some sprites on it constantly switching costumes (associated blocks uploaded below) and it is lagging like crazy. I've read some other online forums and have somewhat self-diagnosed this to be caused by App Inventor not being great at switching costumes rapidly, but this answer seems wrong/doesn't exactly satisfy me.
(Canned Reply: ABG- Export & Upload .aia)
Export your .aia file and upload it here.
Manage you timer event well first.
How many images are you working with, what size are they ?
Here is a simple example, switching 6 images every 100ms
costumeChange.aia (45.2 KB)
if you remove the code I have shown in the previous screenshot, it works/runs smoothly.
working with 23 images, switching every 80 ms at first but tried 160 now.
Why are you using such a fast time interval; consider the duration of an eye blink is on average between 100 and 400 ms . 
You might try 300 ms and eliminate your lag. 
It looks okay on my emulator.
I fixed it... I was playing it on a lower power mode deviec
*device
12 FPS is considered the lowest FPS for our eyes to see an image tho so I figuered I'd divide and that's 83.33... ms so I jst did that lol
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