My site used to load pretty quickly (in about 0.9 seconds), but since a few days loading is suddenly really slow.
With almost all of the optimizations of W3C Total Cache and CloudFlare turned on, it takes 6 seconds to load. Every now and then, it drops to about 19 seconds.
According to the page speed test at Pingdom.com, about 90 percent of the time is used by 'waiting for the server'. Hoewer, not every file has this waiting problem: it's mainly waiting for the 'html' at my WordPress-folder.
It looks like CloudFlare and W3C Total Cache are doing their work: almost all files load swiftly. Something, however, is dragging it down. Do you guys have any idea what this could be?
I've already measured plugin loading speed; that seems to be fine. My database is optimized as well.