Thread Loading Lag from images.

[Solomon]

The problem

On threads that have more than 3 or 4 images there is some substantial lag/wait time in the UI while vue fetches and attempts to render the images even if they are not immediately visible on the screen.

The Proposed Solution

Waiting even a second (plus some randomness to avoid 4 things loading at once) after the message block is on the screen to load any images would likely help to clear up a significant amount of lag.