Thanks for your work on the Scripturizer plugin. It's working quite well, though the ESV tooltips could use a few tweaks, being fairly new.
One is to have uniform behavior when the verse references another translation. With my default as NASB, the ESV tooltip comes up still, unless I actually specify NASB on the end of a verse, in which case it doesn't. I think there should be an additional option in administration, to "Show ESV tooltips for other translations".
Performance is definitely an issue when pulling a large number of requests from the web service. Personally, I think it's better to rely on a page caching layer than add another level of complexity, so it's more of something for the FAQ.
Thanks a lot, Nathan.