The paste below is a demo of a few requests to the API from within the prod cluster. Note that when the badrevid of 21914234230 is included in the request, it takes ~20 seconds to get a response, but requests without it take less than 1/10th of a second
halfak@scb1001:/srv/log/ores$ time wget 'https://pl.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=ids|user|timestamp|userid|comment|size|contentmodel|content&revids=21914234230|3243242|234324' -qO- > /dev/null real 0m21.043s user 0m0.016s sys 0m0.000s halfak@scb1001:/srv/log/ores$ time wget 'https://pl.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=ids|user|timestamp|userid|comment|size|contentmodel|content&revids=3243242|234324' -qO- > /dev/null real 0m0.086s user 0m0.024s sys 0m0.000s halfak@scb1001:/srv/log/ores$ time wget 'https://pl.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=ids|user|timestamp|userid|comment|size|contentmodel|content&revids=21914234230|3243242' -qO- > /dev/null real 0m21.520s user 0m0.024s sys 0m0.000s halfak@scb1001:/srv/log/ores$ time wget 'https://pl.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=ids|user|timestamp|userid|comment|size|contentmodel|content&revids=21914234230|234324' -qO- > /dev/null real 0m22.002s user 0m0.024s sys 0m0.000s