Bulk insert with SQLite.swift, performant way?

I'm trying to do a bulk insert with SQLite Swift. However, I'm not 100% sure if my code is correct. I'm somewhat worried because the performance is is slightly worse then SQLite Phonegap. Although possible I never encountered this before (where Phonegap solutions perform better then Native).

The Swift code I've settled on (because it delivered the best performance timewise) is:

do {
   try DB.transaction { () -> Void in
     for index in 0...num_docs {
       table.insert(data <- "test", data_num <- index)
      } 
    } 
} catch _ {
 throw DataAccessError.Transaction_Error
}

The JS/Phonegap code (for comparison) is:

 this.db.transaction(loadDocs, [], querySuccess, errorCB);
   function loadDocs(tx) {
        var q = "INSERT INTO test_table (data, data_num) VALUES (?,?)";
        for (var i = 0; i < number; i++) {
            tx.executeSql(q, ["test", i], function (tx, res) {})
        }
    }