Our WordPress site runs on an iSeries and we have problems using the main caching plugins (Supercache, T3 Cache etc). All of our pages were taking up to 10 seconds to load, mostly because of the WYSIJA (Mail Poet) and Jetpack plugins. A code trace showed that WYSIJA seemed to take forever looping through POMO and MO functions. As soon as this plugin was installed the site sped up dramatically.
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