speed up creating multiple instances of @Model Class

@Model 
class modelData {
var property1 : String = ""

init(property1: string){
   ...
 }
}

for item in arrayOfManyStrings {
 
let instanceOfModelData = modelData(property1: item)

}

Trying to create multiple instances of my modelData. I expect the loop to run and create instanceOfModelData 30k times. However it is far too slow. 30-90 seconds depending on device.

If I remove the @Model macro, the same loop take < 5 seconds.

I obviously need the @Model for swiftData.

How to speed up creating instances of instanceOfModelData when using @Model