I picked this up on reddit yesterday. I've tried other system searches but they've all been resource hawgs trying to build/maintain the file index. This one is fast.
Q: How long will it take to index my files?
"Everything" only uses file and folder names and generally takes a few seconds to build its database.
A fresh install of Windows XP SP2 (about 20,000 files) will take about 1 second to index.
1,000,000 files will take about 1 minute.
Q: Does Everything search file contents?
No, "Everything" does not search file contents, only file and folder names.
Q: Does "Everything" hog my system resources?
No, "Everything" uses very little system resources.
A fresh install of Windows XP SP2 (about 20,000 files) will use about 3-5mb of ram and less than 1mb of disk space.
1,000,000 files will use about 45mb of ram and 5mb of disk space.
http://www.voidtools.com/