Here's a extract of a patch I'm working on at the moment.
Notice the part in the bottom right corner - I am using the setcell message to change the colour and alpha of the single cell matrix every 20ms.
Is it advisable to use the setcell message this intensively? Is that what it was intended for?
In this patch, there seems to be no problem. However, in the context of my larger patch (a Max for Live device), the matrix seems to be lagging behind the panel (on the left of the patch). It could just be another part of the patch that is causing issues.