This is how to perform a batch delete in CoreData

CoreDataDeleteBatch.swift

private func delete(_ fetchRequest: NSFetchRequest<NSFetchRequestResult>) {
    let batchDeleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
    // Tell me the ids of the objects that you are going to delete
    batchDeleteRequest.resultType = .resultTypeObjectIDs
    
    // execute the deletion at the SQL level
    if let deleteResult = try? container.viewContext.execute(batchDeleteRequest) as? NSBatchDeleteResult {
        // get the IDs of the objects deleted
        if let objectIDs = deleteResult.result as? [NSManagedObjectID] {
            // Merge the deletions into the app's managed object context.
            // We must always do this after performing a batch delete, because a batch delete
            // just remove objects from disk (at SQL level) but not from memory (viewContext).
            NSManagedObjectContext.mergeChanges(
                fromRemoteContextSave: [NSDeletedObjectsKey: objectIDs],
                into: [container.viewContext]
            )
        }
    }
}