Here are a few tips for troubleshooting generator failures.
1. Are you running a WordPress Caching Plugin?
Using caching Plugins can be helpful on traditional hosting platforms but they aren't needed here. Shifter requests each page of your site to generate static versions and caching plugins can conflict with that process.
Some common WordPress Caching Plugins to disable or remove while using on Shifter are the following.
- SNS Count Cache
- WP Super Cache
- Simple Cache
- WP Fastest Cache
- W3 Total Cache
- Comet Cache
- WP Rocket
2. Are there unused themes and plugins?
During the generating process Shifter will index, archive, and copy all the files located within your WordPress install. Themes and plugins installed but not active also get copied. Those plugins or themes could be creating a timeout during the generating process.
Check to see if there are any plugins or themes that you can remove completely.