Crafting a user-friendly interface in Second Life® requires significant effort and skill. Despite our best endeavors, the interface falls short of commonly recognized standards for user interfaces due to the absence of fundamental features such as hover-over reaction or scrolling response.
As we strive to enhance the user interface (UI) in Second Life®, the cost of improvement becomes increasingly apparent. We have to split the code into more and more scripts (mini-programs confined to 64KB of main memory). The more scripts we add, the more challenges arise as we deal with asynchronous execution. Eventually, the maintenance and refactoring of the HUD's code becomes harder and harder. The lack of built-in testing capability means ensuring that nothing is broken after a small change in the code is only possible through a tedious manual testing of every HUD feature.
Also, to make the HUD load resources on demand is practically impossible. If the HUD is made with mesh, every piece of it needs to be loaded fully. The loading of the texture resources can be postponed until needed, but then assets show blurry while loading or even get stuck in partially loaded state. Cached textures allow to display them instantly, but then users receive a notification indicating that a particular HUD exceeds the expected memory usage.
Additionally, here is a list of data-related modifications that can be made after the product is released and delivered to the customer: