Miscellaneous clarifications
QuickGold runs as a SpringBoard addition, and hence is always present. So it uses a little more memory, but it stays completely idle until you invoke it. So, there is no adverse effect on the battery unless there is a bug.
It depends on how much stuff you have on your iPhone. If you have thousands of contacts, the memory usage will increase. If you have thousands of text messages, it will increase even more. Be sure to turn off indexing of things you don't need.
For "normal" people, QuickGold takes about 3-5 megs of memory in general. In contrast, WinterBoard typically takes 11-12 megs.
That's bad. Very bad. But first verify if QuickGold is the culprit. The best way to do that is to install the Cydia package logmailer, and send the syslog report immediately to me at:
zataang.om@gmail.com