Need advice on speeding up tableViewCell photo loading performance
- by ambertch
I have around 20 tableview cells that each contain a number (2-5) thumbnail sized pictures (they are VERY small Facebook profile pictures, ex. http://profile.ak.fbcdn.net/hprofile-ak-sf2p/hs254.snc3/23133_201668_2989_q.jpg). Each picture is an UIImageView added to the cell's contentview.
Scrolling performance is poor, and measuring the draw time I've found the UIImage rendering is the bottleneck.
I've researched/thought of some solutions but as I am new to iphone development I am not sure which strategy to pursue:
preload all the images and retrieve
them from disk instead of URL when
drawing cells (I'm not sure if cell
drawing will still be slow, so I want
to hold off on the time investment
here)
Have the cells display a placeholder
image from disk, while the picture is
asynchronously loaded (this seems to
be the best solution, but I'm
currently not sure exactly how to do
best do this)
There's the fast drawing
recommendation from Tweetie, but I
don't know that will have much affect
if it turns out my overhead is in network loading
(http://blog.atebits.com/2008/12/fast-scrolling-in-tweetie-with-uitableview/)
Thoughts/implementation advice? Thanks!