This has been going on a few revs now but it is annoying.
When I load a project the waveforms look like a block. 
1.  The first track will start to paint but when it moves out of the current view it apparently stops painting until I move it back into view.
2.  It wont paint any of the other tracks until the first one is done.
3. So its one at a time from 1 to 16
 
is this the norm
 
TIA
Rafone

How long is the project?
Has the picture cache been recently cleared? If not, does clearing the cache help?

This problem appears sometimes when a clip consists of 2 or more wav-files - instead 1 single file.
Try to bounce this clip. (Right-click bounce to clip)
If this doesn't help, clear additionally the picture cache.

scook
How long is the project?
Has the picture cache been recently cleared? If not, does clearing the cache help?

Where do I clear the picture cache. 
 
tia

The picture folder is defined in Preferences > File > Audio Data
Delete the contents of the folder.

scook
The picture folder is defined in Preferences > File > Audio Data
Delete the contents of the folder.

That helped not great but better....thx