Here is the step to duplicate
1. create listview with dummy data
2. each item add 1 imageview with load remote image
3. remote image is a large image, for example 5000x5000 with size 1mb
4. listview is hardly scrolled (laggy)
Try above case, change the remote image url to broken link (for example "http://brokenlink.com/image.png")
then try to scroll the item, it very laggy.
I'm not sure it affecting what kind of TI SDK version, but for sure in 5.5.1/6.1.2 GA it was working fine.