Hi experts!
During researching of the SAP UI5 bootstrap process, there are two parameters for asynchronous loading process:
data-sap-ui-async=true / false data-sap-ui-preload="auto / async / sync"
So, data-sap-ui-preload="async" parameter as I understood, can activate async preload only for libraries which declared in
data-sap-ui-libs="sap.m,sap.tnt,....."
And it's OK. In DevTools I see this async preload. ui5loader-dbg uses it's async function "loadJSResourceAsync".

If I set data-sap-ui-async=true parameter, this parameter does the same as data-sap-ui-preload="async" parameter for bootstrap libs, but it works for other modules as well.
So, my bootstrap uses data-sap-ui-async=true parameter.
I expected that libriaries from manifest-file of my Component should loading asynchronously but no..
manifest.json has, for example, four libs which I want to preload, but in DevTools I see Sync loading..
...
"sap.ui5": {
"dependencies": {
"minUI5Version": "1.30.00",
"libs": {
"sap.tnt": {},
"sap.gantt": {},
"sap.fileviewer": {},
"sap.ndc": {}
}
}
Look at this picture

And the ui5loader-dbg uses it sync function as well: requireSync.
What am I missing?
Best regards, Evgeny T.