Joiner makes my file big and slow

So I have a file with around 25000 KB, 700K rows. In this file I have the Product ID but I do not have Product info. and I used Joiner to join another table, which has Product ID and one row of Info. After I joined the table and I remove unnecessary columns in the Joiner. The file goes from 25000 KB to 492000 KB. Also the Data has separate into few sheets How can I make it smaller and faster and keep all data in the same sheet?

Thank you very much