I used version 15.22 of the AlphaControl set in a program where I used TMemoryStream and there were no problems. Upgrading to 16.23 made the TMemoryStream part of my program extremely slow. I think the sSkinManager component slows down code using TMemoryStream excessively. I think it’s a bug since the problem that wasn’t in 15.22 is in 16.23. Sorry for my bad English. Thank you for your answer in advance.