1950472 - Lower the priority of content process for invisible or 1 pixel frames

Status: NEW

(Core :: DOM: Content Processes, enhancement)

Description

[Thinker Li [:sinker]]

The study of bug 1833222 shows loading invisible frames or 1 pixel frame may hurt the page load time. These frames are invisible or just less important from the user's point of view. They should be in a lower priority.

There are two ideas being discussed. (Other ideas?)

1. One is to lower the priority of all cross-origin frames. However, it may hurt some pages that has important content provided by other sites.
2. Another idea is to remember the result of reflow for these frame and lower the priority or delay loading these frame for later page loads.

The first idea is easier. We can try it first and try the second one if necessary!