PHP5.5 has ZendOptimizer opcache built in and it seems to work pretty well and the benchmarks seem to give it a slight edge over APC in performance. Great. So APC seems to be on its way out.
My question regards w3 total cache. W3TC has the option to do database and opcode caching using APC, and I had this working more or less fine with the APCu (APC user cache). Its compatibility with opcache wasn't perfect -- for example, you'd get some weird save issues if you didn't make some tweaks to cache invalidation and so forth.
I'm wondering -- is it worth it at all to use APCu for user stored caches for opcache/dbcache? I turned it off and my CPU load seems a little lower and I'm wondering if I'm really accomplishing anything given that Zend opcache is already doing the heavy lifting (is it?).
I prefer the more vanilla install (no APCu) as it's one less thing to worry about. But I wonder if I'm really losing any performance. Thoughts?