Look at this Task Manager shot:
That’s more than 1.3 gigabytes of RAM that Sidebar.exe is using.
This system, which has a total of 4GB installed, can probably spare it. But still, that’s just a wee bit excessive…
For the record, it’s the first time I’ve seen this, and I might even be able to reproduce the steps. When I killed the process and restarted it, memory usage returned to a more normal 13 megabytes – a 99% reduction.
Update: After a little experimentation, it appears that the Mix07 Countdown gadget is to blame. Buh-bye, silly gadget.