I purchased your plugin today, and it’s causing major problems with my website. On any page with your search enabled, the page does not load properly on first attempt. I monitored the page load in Google Chrome Developer Tools, and it shows that your plugin files wait for 30 seconds and then time out with 502 errors. The page only loads after the files time out.
If you try loading the page again or open another page, it will usually load right away and the search works properly. But then clear your browser cache and once again the page won’t load. By the way, this was happening in Chrome, Firefox and Edge. I didn’t find any errors in the server log.
I tried deactivating all plugins and using the default theme. I believe the conflict is with KeyCDN. I now have all my plugins reactivated except for CDN Enabler used by Key CDN, and it appears to be working normally.
I have tried using various setting combinations within your plugin, but nothing helped.