Slow page load, only with local data stored?

Experiencing very slow page load (in the neighborhood of 9+ seconds) for certain pages I visit often. Is very consistent, but can be “fixed” by clearing all local site data. Waterfall doesn’t appear (to my naive eyes) to show anything to account for the delay. The page finishes loading (according to waterfall), then there are several seconds of blank white screen before the page is displayed.

Again, clearing local storage for the site in question causes the page to load “normally” (taking less than 2 seconds) … but only once. Every subsequent time, whether by link or reload button, even using “reload without cache” experiences the long delay. Screencapture demonstrating my process below. har of waterfall graph available if that might be helpful.

Brave Info: Version 1.2.43 Chromium: 79.0.3945.130 (Official Build) (64-bit)

System Info: Debian Stable (10), installed using repo as:
deb [arch=amd64] buster main

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