I have a SwiftUI project in which I'm using CoreData to save data fetched from an API into the device. I was trying to insert the entities in batches which worked fine until I realized that the relationships when inserting in batched are "untouched":

• An entity Job, which has a one-to-many relationship with the entity Tag.
• A one-to-one relationship with Category.
• A one-to-one relationship with Type.

What I'm doing now is inserting the entities manually in a background task:

container.performBackgroundTask { context in
            for job in jobs {
                let jobToInsert = Job(context: context)
                let type = JobType(context: context)
                let category = Category(context: context)
                
                jobToInsert.id = Int32(job.id)
                ....
                do {
                    print("Inserting jobs")
                    try context.save()
                } catch {
                    // log any errors
                }
}

Is there any way to improve the performance by perhaps doing this in a way that I don't know? Because for the user, when they start the app, inserting the jobs one by one isn't a very nice experience because first, it takes a long time (more than 2 minutes) and second because my UI isn't automatically updated as I'm inserting the entities.

Thanks a lot in advance!

EDIT: I also see the memory increasing and after taking the screenshot and before I stopped the process, I saw the memory in 1.09 GB

EDIT 2: This is the code I used when trying to insert the jobs in batch:

private func newBatchInsertRequest(with jobs: [JobCodable]) -> NSBatchInsertRequest {
        var index = 0
        let total = jobs.count
        let batchInsert = NSBatchInsertRequest(
            entity: Job.entity()) { (managedObject: NSManagedObject) -> Bool in
                guard index < total else { return true }
                if let job = managedObject as? Job {
                    let type = JobType(context: self.container.viewContext)
                    let category = Category(context: self.container.viewContext)
                    let data: JobCodable = jobs[index]
                    job.id = Int32(data.id)
...
return batchInsert

Unfortunately, the relationship can't be built due probably to the context? since I'm getting Thread 13: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) in the line let category = Category(context: self.container.viewContext)