Joining a Virtual Table (FTS) and a regular Table takes a lot of time to execute using sqlite.swift

Question

I'm trying to join query between my Cars regular Table and my Makers Virtual Table for FTS

This is the makers Virtual Table

let markersTable = VirtualTable("makers")
let idColumn = Expression<String>("id")
let name = Expression<String>("name")
let text = Expression<String>("text")
let code = Expression<String>("code")

let config = FTS5Config()
      .column(idColumn)
      .column(name, [.unindexed])
      .column(code)
      .column(text)

and this is the cars regular table

let carsTable = Table("cars")
let idColumn = Expression<String>("id")
let name = Expression<String>("name")
let description = Expression<String>("description")
let makersCode = Expression<String>("makersCode")

The tables can be joined by

let query = carsTable
      .limit(1)
      .join(markersTable, on: makersCode == markersTable[code])

This works but takes a long time and I'm wondering what is the best way to make this join be faster?

I did some tests before using the FTS Virtual Table and if both tables are regular tables, the join is a lot faster.

Any help is appreciated.