How many lists does WebScriber support?
Theoretically there should be no limits to the number of lists WebScriber supports... but practically, it is limited by the speed of the computer runs on.
On a Celeron 400, you can expect WebScriber to manage 20 to 25 lists at once. Beyond that, you start hitting PHP's limits on the maximum execution time for a script. Now, you could change the PHP settings to allow scripts to run longer than 30 seconds, but lets be honest - are site visitors really going to wait more than 30 seconds for a page to load?
So unfortunately for now, the practical limit is about 20 lists. This is, of course, a serious issue and namesuppressed is working to improve performance for future releases of WebScriber. I apologise for any inconvenience this issue has caused you.
This information applies to versions 1.0.4 beta and earlier of WebScriber, and all versions of wbSLM.