http://blogs.msdn.com/b/johngossman/archive/2006/09/05/741797.aspxDuring the past year, we’ve found and fixed a lot of perf issues in Expression and WPF. I’d like to relate a few of them, not so much because you’ll have the exact same problems, but that the pattern of finding and resolving the bugs may be helpful experiencesen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/johngossman/archive/2006/09/05/741797.aspx#747775Sat, 09 Sep 2006 14:41:47 GMT91d46819-8472-40ad-a661-2c78acb4018c:747775ShevaHi, John, could you please elaborate a litte bit about how good performance can be achieved by creating a dedicated empty collection? In my understanding, when the collection is kept empty, it won't occupy too much memory. Sheva<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=747775" width="1" height="1">