It’s more than an “opitcal” issue, it slows down the whole system. I can’t use other programs (or only extreme slow) while installing or copying stuff from mounted images, f.e. I have to close my DVB-T Viewer and other tools (dis)playing stuff in realtime.
As I wrote in the topic, I use WinCDEmu 3.3 (did not tried it with 3.4 yet) on Windows 7 x64, 8GB DDR2 Ram, Intel Q6600 @2,4Ghz. The memory get’s filled with different types of images (iso, ccd, mds, …). It also happened with versions earlier than 3.3. With DaemonTools (which I used before I switched to WinCDEmu) I never had memory issues, if this is from interest.
I don’t know what information you need more in detail to reproduce the problem, please tell me so I can give out more relevant details.