Preload all sites in the sidebar

I’ve already asked before to preload all sites in The Hub 2.0, but this can’t be done because of the amount of data that has to be loaded per site. However, in my understanding this is not the case for the sites in the sidebar. Could it be made so that all sites are preloaded in the sidebar, so switching between sites is more easy?

Furthermore I think the process to load more sites in the sidebar is very buggy. It works very bad from time to time as it gets triggered by scrolling, but even when scrolling on the sidebar, sometimes other parts of the page are scrolling instead.