When updating the CSS, there is no way to see the change right away.
The plugin did not recognize the change in the CSS until we have clicked the "re-check files" button, AND hard-refreshed (ctrl+f5) the browser.
Even then the mobile still shows the old version since we did not cleared the browser cache there.
Please note: we do not cache this website. It seems that a version needs to be updated everytime the files are being rechecked, otherwise the browser will not reload it.
What can we do in order to make use of HummingBird on a highly-rate changing website?