I was looking though my apcu cahe entries and noticed a high amount of accesses to the appinfo/info.xml files. It looks like the info.xml's of every installed app are accessed on every request. With apcu they are cached, so they are not parsed again and again. The info.xml's arent changed very often, so wouldnt it be better to cache the whole appinfos in one big cache entry? Or alternatively, if the softwares design allows this, to load only the required appinfos for the current request?
Maybe this is a none issue, but it looks like there is a great overhead involved in reading all the info.xmls of all apps for every request.