Static Generation Takes a Long Time

Generating the static version of a site which has 319 files (according to the on-screen log and debug log) takes nearly 15 minutes. During this time, the first 100 files are created in about 30 seconds, and then everything hangs for roughly 4 minutes. The debug log shows nothing unusual in this time, and the server shows no high usage or other issues that would be holding it back. This happens then again around 210 files finished, then at 270 files finished, and then the plugin finishes. The three pauses contribute more than 12 minutes of time to the generation process, which would otherwise take a couple minutes if that.

I have the full debug log available, and the first pause happens at line 1391 which waits from 15:48:06 to 15:52:44 while doing nothing as far as I can tell. Let me know how to go about debugging this further.