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Lighthouse shows the total size in kibibytes (KiB) of all resources requested by your page. The largest requests are presented first:
Based on HTTP Archive data, the median network payload is between 1,700 and 1,900 KiB. To help surface the highest payloads, Lighthouse flags pages whose total network requests exceed 5,000 KiB.
See the Lighthouse performance scoring post to learn how your page's overall performance score is calculated.
Aim to keep your total byte size below 1,600 KiB. This target is based on the amount of data that can be theoretically downloaded on a 3G connection while still achieving a Time to Interactive of 10 seconds or less.
Here are some ways to keep payload size down:
Consider using Responsive Image Styles to reduce the size of images loaded on your page. If you are using Views to show multiple content items on a page, consider implementing pagination to limit the number of content items shown on a given page.
Consider showing excerpts in your article categories (e.g. via a "read more" link), reducing the number of articles shown on a given page, breaking your long posts into multiple pages, or using a plugin to lazy-load comments.
Consider showing excerpts in your post lists (e.g. via the "more" tag), reducing the number of posts shown on a given page, breaking your long posts into multiple pages, or using a plugin to lazy-load comments.
Source code for Avoid enormous network payloads audit