If you’re experiencing inconsistent TTFB (Time to First Byte) on your WordPress site, there are several potential causes to consider. First, check for any plugins or themes that may be causing delays, and deactivate them to see if this improves TTFB.

You can also check for issues with your hosting provider or server configuration, such as slow disk speed or CPU throttling. Other factors that may impact TTFB include the size and complexity of your website, as well as external factors like network latency. If your website is hosted on a shared hosting plan or a smaller VPS, high server load can be a common cause of increased TTFB. To address this issue, consider upgrading your hosting plan or optimizing your website to reduce the load on your server.