In my previous post about XPages I complained (among other things!) about XPages build time:
http://www-10.lotus.com/ldd/nd85forum.nsf/b/34c8e385b508d5f68525772e0042b531
At that point I thought that XPage is built when it’s saved. But no, according to my testing it is built when accessed the first time. That would be somehow acceptable but after an embarrasing demo I realized that XPages go to sleep at night and take 15-50 sec to wake up when accessed after that. In my next embarrasing demo I noticed that they actually go to sleep also at day time, maybe after about 1 hour inactivity, and then you wait again 15-50sec for the page to load. And yes, my persistence setting is “Keep pages in memory”.
Based on these findings I find XPages totally unusable currently.