Lag when using an SSX in a Search Grid Cell UIX

Step to reproduce

• Create custom SearchGridCell UIX for a given XClass "MyClass"
• Add SSX to that UIX and load it from the UIX script (in simple CSS or LESS syntax)
• Use SearchGrid with query returning result pages which have an XObject of type "MyClass"

Actual result

In the Search Grid results, the CSS rules defined in the custom UIX are loaded only after the search results have been displayed, hence the user has to wait a bit before the content gets laid out correctly.

A workaround consist in setting up the SSX directly in the page displaying the Search Grid rather than in the UIX used for that Grid.