Requests Stalling for Exactly 60 Seconds

Hi! I've been dealing with an issue over the past few days after merging the new bundling changes into my app. Most of my requests seem to stall for exactly 60 seconds. 

On a typical request, the console will show that the server rendered the file successfully in an expected response time, but the browser continues to load. In dev-tools, the browser waits (TTFB) for exactly 1 minute.

Any ideas? Is there anything else I can show to help?

To add, I've tried different parallelization configurations for Puma, using threads and workers, and I've tried using Phusion Passenger. I've git diffed my repo against JSP just to see if I had some residual webpack files or something, and nothing seems out of the ordinary. + a million other small things I don't remember at this point.