Loading Message for Dynamic Page?

I have a dynamic page that reaches out to another remote system and queries live data in order to build the page. So, the page can take anywhere from 3 to 10 seconds to load depending on the bandwidth/latency between my UD server and remote system. Is there any way to display a “Page Loading. Please wait…” message to the user while the endpoint scriptblock is being executed to build the dynamic page? Currently, the header/footer load but the body of the page is blank until endpoint execution completes. That’s not ideal. Thanks in advance for any tips or pointers!

There is a preloader element: New-UDPreloader.
Here is an example:

Thanks @psott. In that example, is $Cache:Loading a built-in variable created and updated by the module, or is it something I have to define/update?

I figured this out. This example was particularly helpful:

Here’s the formula:

$PageEndpoint = {

    #region Loading Indicator
    $Session:DoneLoading = $false

    New-UDRow -Columns {
        New-UDColumn -Endpoint {
            New-UDElement -Id 'LoadingMessage' -Tag div -Endpoint {
                if ($Session:DoneLoading -ne $true) {
                    New-UDHeading -Text "Loading...Please wait..." -Size 5
                    New-UDPreloader -Size small

    New-UDColumn -Size 12 -Endpoint {
        Build your time-intensive page here.

        # Remove the Loading Indicator
        $Session:DoneLoading = $true
        Sync-UDElement -Id 'LoadingMessage' -Broadcast

$DynamicPage = New-UDPage -Url "/example/:sys" -Endpoint $PageEndpoint