I was inspired to try again, when ChadK said
here that he had successfully setup phpdig in a subdomain. (I started this new thread because I thought it would be a bit rude to hijack that other thread, since the original subject was different).
The last time I tried this, I got the search to work but not the spidering. This time, it's the other way around.

However, the real reason for this post is that phpdig is spidering extremely slow from my subdomain, and I have sleep(2) in spider.php, as discussed in
this thread.
So... any idea why spidering would be so much slower within a subdomain than in a subfolder?