Don't count table records will speed up conversion somewhat, but you lose the very useful progress bars as data is being copied.

Fetch metadata only for selected tables is useful if you have a very slow source database with a lot of tables but need to copy just a few tables over. If so, we will read table structure only as you select a table.

Parallel workers define how many tables are processed in parallel. The higher the number, the more performant all operations are. If your databases are underpowered and you want to reduce the load on them, you can specify a lower number.