20 threads blocked on: at com.xpn.xwiki.render.DefaultVelocityManager.getVelocityEngine(DefaultVelocityManager.java:177) - waiting to lock <0x637cbe38> (a com.xpn.xwiki.render.DefaultVelocityManager) at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:105) https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwi… The holder of this lock calls context.getWiki().getSkinFile("macros.vm", skin, context); and context.getWiki().exists(skin, context), both of which potentially access the database while holding a global lock. Looks like some delicious low hanging fruit to me. Thanks, Caleb Original message removed because it is too big for the list. See it here: https://ezcrypt.it/4H5n#8mjU1voDtZsANw9vsLa8WM8Y