Sluggish image loading

[Mehuge]

Images currently seem sluggish to load. The effect can be seen using the new scenario join UI, as well as anything using the tabbed dialog UI. In both cases, the window chrome can visibly be seen to load, and in the latter case, the background-images for the scenario also appears after some noticeable time.

Other UIs the exhibit this sluggishness include:

Ability Bar
Inventory

Basically anything that includes images.

I tried adding a pre-load image function to the UI but it made no difference. I notice also in the coherent debugger, network tab, it says Cached: No for everything even on subsequent loads.

@mmeehan said he will investigate when he has time, and I should log it in the mean time.