Slow TTFB

I’m working on a project that was sort of handed over to me. This file was tucked away in the wp-content folder, pretty much unnoticed (and unused from what I can tell). I updated MAMP Pro from 4.0.6 to 4.1, and while I’m not sure what the difference was in the update (PHP Version or MySQL, or Memcached), but I immediately started noticing an extremely slow TTFB and other major delays, particularly in the Pages admin screen where it took a second or two to load each Page in the Pages table. After rolling back to previous version of MAMP, also tried re-installing MAMP I was still experiencing this issue. I finally realized this file was there and disabled it and noticed instant performance gains. I didn’t install this, nor do I think it’s even being used, however I am curious what’s going on with it and why it would slow down my site so much. I know I’m not offering much feedback about my setup, but I spent hours hunting this issue down and am just relieved to have discovered the source of the issue. I’ve forwarded this along to the people at MAMP in hopes they might can shed some light on the issue. If you have any information about it, I’d love to hear it. Thanks!